Page   1
    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID 2298c
                                                       Report Date: 09-May-96:17:02
                                                       Version: **********
                                                       Check-in Date: **********

1.Proposal Title:
STELLAR CONTENT OF GALAXIES AND GLOBULAR CLUSTERS
------------------------------------------------------------------------------------
2. Scientific Category   3. Proposal For  4. Proposal Type        5. Continuation ID
GALAXIES & CLUSTERS         GO                                       <none>
Sub Category
NEARBY GALAXIES
------------------------------------------------------------------------------------
6. Principal Investigator   Institution                    Country    Telephone
P.i. David  Burstein        ARIZONA STATE UNIVERSITY       USA        602-965-3561/4
PROFESSOR
------------------------------------------------------------------------------------
7. Abstract
Our goal is to establish a spectroscopic method which can reliably distinguish the
effects of age from those of chemical composition in the integrated light of stellar
populations older than one billion years. This program forms an essential link
between two of HST's most powerful capabilities: detailed color-magnitude diagram
(CMD) studies of nearby galaxies and globular clusters, and integrated light studies
of high redshift galaxies in early phases of evolution. As a first step, we propose
to obtain high precision FOS ultraviolet spectroscopy of bright, nearby
extragalactic systems, to combine this with ground-based and IUE data in a
comprehensive spectral synthesis analysis, and to compare the results with
independent CMD studies by HST. Our results will help us to develop an effective
method for interpreting the lower S/N data which will be available for distant
objects at large lookback times.
------------------------------------------------------------------------------------
8. Scientific Key Words:   GALAXIES: STELLAR POPULATIONS; GLOBULAR CLUSTERS:
INTEGRATED SPECTRA
------------------------------------------------------------------------------------
9. Est obs time (hours) pri: 15.00    par: 0       10. Num targs pri: 4      par: 0
------------------------------------------------------------------------------------
11. Instruments requested:  FOS WF/PC
------------------------------------------------------------------------------------
------------------------------------------------------------------------------------
                                                                  Page   2
I. GENERAL FORM    Proposal 2298c
PI: P.i. David  Burstein
Proposal Title:
STELLAR CONTENT OF GALAXIES AND GLOBULAR CLUSTERS
------------------------------------------------------------------------------------

1. Proposers:
Proposers                        Institution                       Country       ESA
------------------------------------------------------------------------------------
P.I. David Burstein              ARIZONA STATE UNIVERSITY          USA
Prof. Jay A. Frogel              OHIO STATE UNIVERSITY             USA
Prof. James A. Rose              NORTH CAROLINA, UNIVERSITY OF     USA
Prof. Marcia Rieke               ARIZONA, UNIVERSITY OF            USA
Prof. Robert W. O'Connell        VIRGINIA, UNIVERSITY OF           USA
Prof. Chi-Chao Wu                STSCI                             USA
------------------------------------------------------------------------------------
  3. Description of proposed observations.
  The principal observing requirements for this program are: (a) accessibility to
 the 2200-3300 angstrom region; (b) a minimum S/N of 20 for spectral resolution
 elements of <10 angstrom for wavelengths >2500 angstroms; and (c) a desired S/N >
 50 for objects where this does not require integrations longer than  ~1 hour.
 All of the program objects are extended sources.  Our requirements can only be
 met in reasonable integration times by using the FOS with gratings and the 1"
 square entrance aperture.  For this proposal we assume that no WFC/PC images of
 these objects will be accessible to this program at the time of observations.
 WFC exposures with the F336W filter provide the best compromise between the need
 to locate the center of the objects relative to offset star(s), and the desire to
 examine the extended ultraviolet images of these objects for the presence of
 bright, hot stars. Three separate FOS spectra are needed for each object: a) The
 Blue Digicon (FOS/Blue) will be used to obtain a low S/N spectrum for 1150 - 1700
 ang., using the G130H grating. (Note:  We would prefer to use the 160L grating,
 but feel we cannot, due to scatter light problems reported on pg. 13 of FOS
 Instrument Handbook, Suppl. 1, May 1989.)  These observations are essential to
 determine the contribution of   stars hotter than 15000 deg K and to remove their
 effects from the longer wavelength data.  Relatively long exposures are needed,
 even for the low (~100 ang) resolution required. b) The Red Digicon (FOS/Red)
 will be used to obtain: (i) A high S/N, 5.5 ang resolution sprectrum from 2200-
 3300 ang, using the G270H grating; and (ii) A high S/N, 8.3 ang reolution
 spectrum from 3250-4800 ang, using the G400H grating, which provides overlap with
 ground-based data and measures important features such as NH, CN and Ca II at the
 same spatial resolution as the UV data. There is a 50 ang. overlap between
 gratings G270H and G400H. There is a 500 ang. gap between G130H and G270H.  Since
 this gap covers the 1700-2200 ang. region, where IUE spectra indicate that flux
 from these objects is at a minimum, this gap will not be covered with the current
 set of observations.  All S/N ratios are calculated per spectral resolution
 element.  In the exposure time calculations, it is assumed that the FOS/Blue and
 FOS/Red exposures will be taken on separate orbits.  In addition to meeting our
 scientific criteria, the targets for this program were selected for expected UV
 brightness, relatively low background contamination and extinction, and for
 having planned GTO observations of CMD's.
                                                                  Page   3
------------------------------------------------------------------------------------
  4. Justification of need for HST observations.
  High S/N observations at spectral resolutions of 10 ang. in the region 2200-3300
 ang. are required.  Only HST can provide such data.  The small aperture
 observations of M31 globular clusters possible with HST will maximize the cluster
 signal with respect to the of the background from the bulges and disks of these
 galaxies.  This cannot be reliably done from the ground.  The combined ground-
 based data available to us from our own separate programs include integrated
 spectra for ~700 galaxies, sellar spectra for ~500 stars, and visible/IR spectra
 energy distributions for ~200 galaxies.  Among our group, we have previous or
 ongoing observations with IUE of:  normal F,G,K main sequence stars; G,K giant
 stars; M31 globular cluster (poor S/N); elliptical galaxies and Seyfert galaxies.
 By the time of our HST observations we will have an ultraviolet stellar 'library'
 containing ~1500 stars.  Some of the results of these ongoing studies are cited
 in Section 2 above.
------------------------------------------------------------------------------------
  5. Description of special scheduling requirements.
  We have estimated average fluxes centered at 5 wavelengths for each object,
 based in most cases on extrapolations from IUE data either of the object itself
 or of an object of similar spectral energy distribution.   V magnitudes with a 1"
 square apertue are estimated from available photoelectric photometry.  If our
 spectra achieve the required S/N for these 5 regions, they will yield the desired
 S/N for the whole spectrum.  The spectral resolutions used in the calculations of
 S/N listed in the Exposure section are: 100 ang. at 1500 ang., 5.5 ang. at 2500
 ang., 2800 ang. and 3100 ang., and 8.3 ang. at wavelengths 3500 ang. and longer.
 As FOS/Blue is much less sensitive than FOS/Red at all wavelengths >1600 ang.,
 our strategy is to use FOS/Blue only for the G130H observations (we cannot use
 the G160L due to scattered light problems), and to integrate for at least one
 orbit (~1700 sec).  In some cases this procedure will yield higher S/N for the
 bluer clusters, thus permitting us to obtain wavelength resolution higher than
 100 ang. at comparable S/N.  FOS/Red will be used for the G270H and G400H
 observations. Object      log Continuum Flux (ergs/cm2/s/ang.) 1500A  2500A
 2800A  3100A  3500A G130H  G270H  G270H  G270H  G400H   K58  M31GC -15.85 -15.75
 -15.70 -15.45 -15.30 M II M31GC -15.20 -15.50 -15.20 -15.10 -14.95 M IV M31GC -
 14.95 -15.50 -15.60 -15.45 -15.30 K280 M31GC -15.50 -15.65 -15.40 -15.15 -15.00
------------------------------------------------------------------------------------
  6. Description of special calibration exposures.
  (a)  Since all of the objects in this program will have low UV flux levels,
 avoidance of additional sources of background, such as the Gegenshein, is
 desirable. (b)  N/A
                                                                  Page   4
------------------------------------------------------------------------------------
  7. Data reduction and analysis plans.
  The spectra will be reduced to absolute fluxes, the three spectral regions
 combined and reliable S/N estimates obtained.  We will use HST software for this
 phase. The spectral line features of each spectrum will be intercompared and
 measured in a consistent manner according to methods we have already developed
 using IUE observations of stars.  Corresponding visible and infrared spectral
 energy distributions of the same objects will be added (Question 8), providing
 complete wavelength coverage from 1200 ang. to 2.2 microns, with <10 ang.
 resolution out to 1 micron.  Telescopes such as the MMT and the CFHT have
 demonstrated that it is possible to obtain ground-based observations with 1"-2"
 spatial resolution.  Observations at >4500 ang. are little affected by
 atmospheric refraction. As part of the initial analysis, the spectral line
 indices of 500 stars measured by Burstein, Faber and collaborators, of 300 stars
 measured by Rose, and of 200 stars measured by O'Connell will be combined into a
 unified data base.  All stellar observations made by IUE of reasonable S/N (over
 10,000 spectra for ~2000 stars) are being reprocessed by DB, RWO, CCW, Ralph
 Bohlin and Linda Stryker.  These spectra will be analyzed in a manner similar to
 the HST spectra, and an external calibration of age, metallicity and gravity will
 be establshed for each UV index.  Preliminary analysis indicates that the UV line
 indices between 2400-3200 ang. are sensitive primarily to temperature, with
 gravity and metallicity effects of much less importance (a paper disussing this
 is in prepartion). The full UV-to-IR spectral energy distributions of the targets
 will then be analyzed in two independent ways: 1) With the optimizing spegtral
 synthesis program of O'Connell; 2) Using the evolutionary modeling methods
 developed by Faber, Burstein and collaborators and by Rose, which give greater
 emphasis to the correlations among the absorption-line indices.  A primary goal
 of the project is to compare the populations of the globular clusters, as
 inferred from these analyses, to the known CMD's obtained by other HST observers.
 It is obviously essential that the deduced ages and metallicities of these two
 different approaches agree.  Any discrepencies will require careful study.
------------------------------------------------------------------------------------
  8. Additional comments or special requests.
  Accurate target positions for these objects must be obtained directly with an
 HST imaging device, as all of these objects are extended, and the precise center
 positions of M31 globular clusters are difficult to determine from ground-based
 observations.  All M31 cluster are exepcted to have WFC exposure obtained in GTO
 programs for CMD's. This proposal assumes that no WFC images will be accessible
 to us, either through absence or propriety, so that we will need to make 4 WFC
 exposures.
------------------------------------------------------------------------------------
  9. Description of previous HST work.
  (a)  N/A (b)  N/A (c)  N/A
------------------------------------------------------------------------------------
 10. Resources to be supplied by investigator's institution(s).
  The majority of support from our home institutions comes in the form of computer
 facilities.  Although we can only dimly perceive what those facilities might be
 in 1.5 years, it is probably relevent to list what facilities we currently have
 that could reduce HST data it were made avaialble today: Burstein/ASU:
 VAX750+1Gb disk+Jupiter 7 Image Disp/Conn to VAX, IBM, Cray 4MP O'Connell/UVa:
 microVAX II+IVAS image disp+1Gb disk; SUN +AT&T clusters Frogel/OSU:    SUN 386i,
 VAX 780, microvaxes, Cray supercomputer Rose/UNC:      SUN 3/60C, Convex,
 supercomputer Wu/CSC:        Access to STScI facilities Rieke/UofA:    Various
 mini-computers; Steward Obs. imaging analysis facilities
------------------------------------------------------------------------------------
11. Address Information
                                                                  Page   5
Name:  DAVID BURSTEIN                                      Category: PI
Institution: ARIZONA STATE UNIVERSITY
Address:  DEPT. OF PHYSICS AND ASTRONOMY
City: TEMPE                                     State: AZ
Zip Code: 85287                                 Country: USA
Telephone: 602-965-3561/4336
Telex (or e-mail):
------------------------------------------------------------------------------------
Name:  ROBERT W. O'CONNELL                                 Category: CON
Institution: UNIVERSITY OF VIRGINIA
Address:  DEPT. OF ASTRONOMY
          P.O BOX 3818
City: CHARLOTTESVILLE                           State: VA
Zip Code: 22903                                 Country: USA
Telephone: 804-924-7494
Telex (or e-mail):
------------------------------------------------------------------------------------
TARGET LIST    a) Fixed Targets                                                                    ID = 2298c            [  6]
------------------------------------------------------------------------------------------------------------------------------------
 1 |     2      |           3           |              4             |  5     |   6    |  7  |              8
------------------------------------------------------------------------------------------------------------------------------------
Tar|   Target   |         Target        |            Target          |Coord   | Radial |Acqui|FLX|     Flux data
No |    Name    |       Description     |           Position         |Eqnx    |  Vel.  |Prblm|REF|
   |            |                       |                            |        |        |     |   |
------------------------------------------------------------------------------------------------------------------------------------
1   K58-EXT-     EXT-CLUSTER; MODERATELY TBD-EARLY,                   2000     V = -200 BKG   1   V = 16.2 +/- 0.5
    CLUSTER-M31  METAL-RICH              RA=0H 40M 26.4S +/- 1.0",                      EXT   2   B-V = 0.93 +/- 0.05, E(B-V) = 0.08
    V55-EXT-     GLOBULAR CLUSTER IN M31 DEC=+41D 27' 26.3" +/- 1.0"                          3   F-CONT(1500) = 1.4 +/- 0.3 E-16
    CLUSTER-M31                                                                               4   F-CONT(2500) = 1.8 +/- 0.3 E-16
                                                                                              5   F-CONT(2800) = 2.0 +/- 0.4 E-16
                                                                                              6   F-CONT(3100) = 3.6 +/- 0.5 E-16
                                                                                              7   F-CONT(3500) = 5.0 +/- 0.5 E-16
     Comments: EARLY-ACQ MUST BE TAKEN TO BE ABLE TO
             CENTER CLUSTERS TO <=0.1" IN FOS V MAG
             ESTIMATED IN 1" SQUARE APER INDIVIDUAL
             STARS IN CLUSTER HAVE MAGS 4-7 MAG FAINTER
             S/N CALCULATIONS FOR FLUXNUM 3-7 ARE FOR
             SPECTRAL RESOLUTIONS OF 3 - 100A, 4 -
             5.5A, 5 - 5.5A 6 - 5.5A, 7 - 8.3A
------------------------------------------------------------------------------------------------------------------------------------
2   K58-OFFSET   TO BE FOUND OFFSET STAR RA-OFF = +0S +/- 6S,
                 FOR K58, M31 EXT-CLUST  DEC-OFF = +0' +/- 1',
                                         FROM 1, TBD-EARLY
     Comments: TBD-EARLY
------------------------------------------------------------------------------------------------------------------------------------
3   MII-EXT-     EXT-CLUSTER; MODERATELY TBD-EARLY,                   2000     V = -200 BKG   1   V = 14.5 +/- 0.5
    CLUSTER-M31  METAL-RICH              RA = 0H 32M 46.6S +/- 1.0",                    EXT   2   B-V = 0.88 +/- 0.05, E(B-V) = 0.08
    K1-EXT-      GLOBULAR CLUSTER IN M31 DEC = +39D 34' 39.6" +/-                             3   F-CONT(1500) = 6.3 +/- 0.6 E-16
    CLUSTER-M31                          1.0"                                                 4   F-CONT(2500) = 3.2 +/- 0.5 E-16
                                                                                              5   F-CONT(2800) = 6.3 +/- 0.6 E-16
                                                                                              6   F-CONT(3100) = 7.9 +/- 0.7 E-16
                                                                                              7   F-CONT(3500) = 1.1 +/- 0.2 E-15
     Comments: EARLY-ACQ MUST BE TAKEN TO BE ABLE TO
             CENTER CLUSTERS TO <=0.1" IN FOS V MAG
             ESTIMATED IN 1" SQUARE APER INDIVIDUAL
             STARS IN CLUSTER HAVE MAGS 4-7 MAG FAINTER
             S/N CALCULATIONS FOR FLUXNUM 3-7 ARE FOR
             SPECTRAL RESOLUTIONS OF 3 - 100A, 4 -
             5.5A, 5 - 5.5A 6 - 5.5A, 7 - 8.3A
------------------------------------------------------------------------------------------------------------------------------------
4   MII-OFFSET   TO BE FOUND OFFSET STAR RA-OFF = +0S +/- 6S,
                 FOR MII, M31 EXT-CLUST  DEC-OFF = +0' +/- 1',
                                         FROM 3, TBD-EARLY
     Comments: TBD-EARLY
------------------------------------------------------------------------------------------------------------------------------------
TARGET LIST    a) Fixed Targets                                                                    ID = 2298c            [  7]
------------------------------------------------------------------------------------------------------------------------------------
 1 |     2      |           3           |              4             |  5     |   6    |  7  |              8
------------------------------------------------------------------------------------------------------------------------------------
Tar|   Target   |         Target        |            Target          |Coord   | Radial |Acqui|FLX|     Flux data
No |    Name    |       Description     |           Position         |Eqnx    |  Vel.  |Prblm|REF|
   |            |                       |                            |        |        |     |   |
------------------------------------------------------------------------------------------------------------------------------------
5   MIV-EXT-     EXT-CLUSTER; VERY METAL TBD-EARLY,                   2000     V = -200 BKG   1   V = 15.9 +/- 0.5
    CLUSTER-M31  -POOR                   RA = 0H 43M 17.8S +/- 1.0",                    EXT   2   B-V = 0.69 +/- 0.05, E(B-V) = 0.08
    K219-EXT-    GLOBULAR CLUSTER IN M31 DEC = +39D 49' 12.8" +/-                             3   F-CONT(1500) = 1.1 +/- 0.2 E-15
    CLUSTER-M31                          1.0"                                                 4   F-CONT(2500) = 3.2 +/- 0.4 E-16
                                                                                              5   F-CONT(2800) = 2.5 +/- 0.4 E-16
                                                                                              6   F-CONT(3100) = 3.5 +/- 0.5 E-16
                                                                                              7   F-CONT(3500) = 5.0 +/- 0.5 E-16
     Comments: EARLY-ACQ MUST BE TAKEN TO BE ABLE TO
             CENTER CLUSTERS TO <=0.1" IN FOS V MAG
             ESTIMATED IN 1" SQUARE APER INDIVIDUAL
             STARS IN CLUSTER HAVE MAGS 4-7 MAG FAINTER
             S/N CALCULATIONS FOR FLUXNUM 3-7 ARE FOR
             SPECTRAL RESOLUTIONS OF 3 - 100A, 4 -
             5.5A, 5 - 5.5A 6 - 5.5A, 7 - 8.3A
------------------------------------------------------------------------------------------------------------------------------------
6   MIV-OFFSET   TO BE FOUND OFFSET STAR RA-OFF = +0S +/- 6S,
                 FOR MIV, M31 EXT-CLUST  DEC-OFF = +0' +/- 1',
                                         FROM 5, TBD-EARLY
     Comments: TBD-EARLY
------------------------------------------------------------------------------------------------------------------------------------
7   K280-EXT-    EXT-CLUSTER; METAL-RICH TBD-EARLY,                   2000     V = -200 BKG   1   V = 15.0 +/- 0.5
    CLUSTER-M31  GLOBULAR CLUSTER IN M31 RA = 0H 44M 29.5S +/- 1.0",                    EXT   2   B-V = 0.95 +/- 0.05, E(B-V) = 0.08
    V282-EXT-                            DEC = +41D 21' 35.5" +/-                             3   F-CONT(1500) = 3.2 +/- 0.5 E-16
    CLUSTER-M31                          1.0"                                                 4   F-CONT(2500) = 2.2 +/- 0.4 E-16
                                                                                              5   F-CONT(2800) = 4.0 +/- 0.5 E-16
                                                                                              6   F-CONT(3100) = 7.1 +/- 0.7 E-16
                                                                                              7   F-CONT(3500) = 1.0 +/- 0.1 E-15
     Comments: EARLY-ACQ MUST BE TAKEN TO BE ABLE TO
             CENTER CLUSTERS TO <=0.1" IN FOS V MAG
             ESTIMATED IN 1" SQUARE APER INDIVIDUAL
             STARS IN CLUSTER HAVE MAGS 4-7 MAG FAINTER
             S/N CALCULATIONS FOR FLUXNUM 3-7 ARE FOR
             SPECTRAL RESOLUTIONS OF 3 - 100A, 4 -
             5.5A, 5 - 5.5A 6 - 5.5A, 7 - 8.3A
------------------------------------------------------------------------------------------------------------------------------------
8   K280-OFFSET  TO BE FOUND OFFSET STAR RA-OFF = +0S +/- 6S,
                 FOR K280, M31 EXT-CLUST DEC-OFF = +0' +/- 1',
                                         FROM 7, TBD-EARLY
     Comments: TBD-EARLY
------------------------------------------------------------------------------------------------------------------------------------
EXPOSURE LOGSHEET                                                                                  ID = 2298c            [  8]
------------------------------------------------------------------------------------------------------------------------------------
 1      |   2   |      3    |  4   |   5   |   6   |    7   |   8   |       9       |10 |   11  |   12    |13 |14|        15
------------------------------------------------------------------------------------------------------------------------------------
  Line  |  Seq  |   Target  |Instr | Oper. | Aper  |Spectral|Central|   Optional    |Num|  Time |   S/N   |Flx|Pr|     Special
 Number | Name  |    Name   |Config| Mode  |or FOV |Element |Waveln.|  Parameters   |Exp|       |Rel. Time|Ref|  |   Requirements
------------------------------------------------------------------------------------------------------------------------------------
1                K58-EXT-    WFC    IMAGE   ALL     F336W            CR-SPLIT=0.5    1   700S              1   1  CYCLE 1 / 1-32
                 CLUSTER-M31                                         CR-                                          EARLY ACQ FOR 2-8
                                                                     TOLERANCE=0.2
                                                                     PRE-FLASH=YES
------------------------------------------------------------------------------------------------------------------------------------
2                K58-OFFSET  FOS/BL ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 2-4 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 3-
                                                                                                                  4
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
3                K58-EXT-    FOS/BL ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
4                K58-EXT-    FOS/BL ACCUM   1.0-    G130H    1300    STEP-           1   5905S   25        3   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 100A
               RESOLUTION AT 1500A
------------------------------------------------------------------------------------------------------------------------------------
5                K58-OFFSET  FOS/RD ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 5-8 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 6-
                                                                                                                  8
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
6                K58-EXT-    FOS/RD ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
7                K58-EXT-    FOS/RD ACCUM   1.0-    G270H    2700    STEP-           1   2756S   30        5   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 5.5A
               RESOLUTION AT 2800A
------------------------------------------------------------------------------------------------------------------------------------
8                K58-EXT-    FOS/RD ACCUM   1.0-    G400H    4000    STEP-           1   483S    28        7   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 8.3A
               RESOLUTION AT 3500A
------------------------------------------------------------------------------------------------------------------------------------
EXPOSURE LOGSHEET                                                                                  ID = 2298c            [  9]
------------------------------------------------------------------------------------------------------------------------------------
 1      |   2   |      3    |  4   |   5   |   6   |    7   |   8   |       9       |10 |   11  |   12    |13 |14|        15
------------------------------------------------------------------------------------------------------------------------------------
  Line  |  Seq  |   Target  |Instr | Oper. | Aper  |Spectral|Central|   Optional    |Num|  Time |   S/N   |Flx|Pr|     Special
 Number | Name  |    Name   |Config| Mode  |or FOV |Element |Waveln.|  Parameters   |Exp|       |Rel. Time|Ref|  |   Requirements
------------------------------------------------------------------------------------------------------------------------------------
9                MII-EXT-    WFC    IMAGE   ALL     F336W            CR-SPLIT=0.5    1   700S              1   1  EARLY ACQ FOR 10-
                 CLUSTER-M31                                         CR-                                          16
                                                                     TOLERANCE=0.2
                                                                     PRE-FLASH=YES
------------------------------------------------------------------------------------------------------------------------------------
10               MII-OFFSET  FOS/BL ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 10-12 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 11
                                                                                                                  -12
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
11               MII-EXT-    FOS/BL ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
12               MII-EXT-    FOS/BL ACCUM   1.0-    G130H    1300    STEP-           1   1680S   33        3   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 100A
               RESOLUTION AT 1500A
------------------------------------------------------------------------------------------------------------------------------------
13               MII-OFFSET  FOS/RD ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 13-16 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 14
                                                                                                                  -16
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
14               MII-EXT-    FOS/RD ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
15               MII-EXT-    FOS/RD ACCUM   1.0-    G270H    2700    STEP-           1   1939S   46        5   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 5.5A
               RESOLUTION AT 2800A
------------------------------------------------------------------------------------------------------------------------------------
16               MII-EXT-    FOS/RD ACCUM   1.0-    G400H    4000    STEP-           1   855S    48        7   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 8.3A
               RESOLUTION AT 3500A
------------------------------------------------------------------------------------------------------------------------------------
EXPOSURE LOGSHEET                                                                                  ID = 2298c            [ 10]
------------------------------------------------------------------------------------------------------------------------------------
 1      |   2   |      3    |  4   |   5   |   6   |    7   |   8   |       9       |10 |   11  |   12    |13 |14|        15
------------------------------------------------------------------------------------------------------------------------------------
  Line  |  Seq  |   Target  |Instr | Oper. | Aper  |Spectral|Central|   Optional    |Num|  Time |   S/N   |Flx|Pr|     Special
 Number | Name  |    Name   |Config| Mode  |or FOV |Element |Waveln.|  Parameters   |Exp|       |Rel. Time|Ref|  |   Requirements
------------------------------------------------------------------------------------------------------------------------------------
17               MIV-EXT-    WFC    IMAGE   ALL     F336W            CR-SPLIT=0.5    1   700S              1   1  EARLY ACQ FOR 18-
                 CLUSTER-M31                                         CR-                                          24
                                                                     TOLERANCE=0.2
                                                                     PRE-FLASH=YES
------------------------------------------------------------------------------------------------------------------------------------
18               MIV-OFFSET  FOS/BL ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 18-20 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 19
                                                                                                                  -20
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
19               MIV-EXT-    FOS/BL ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
20               MIV-EXT-    FOS/BL ACCUM   1.0-    G130H    1300    STEP-           1   1680S   41        3   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 100A
               RESOLUTION AT 1500A
------------------------------------------------------------------------------------------------------------------------------------
21               MIV-OFFSET  FOS/RD ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 21-24 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 22
                                                                                                                  -24
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
22               MIV-EXT-    FOS/RD ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
23               MIV-EXT-    FOS/RD ACCUM   1.0-    G270H    2700    STEP-           1   2009S   29        5   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 5.5A
               RESOLUTION AT 2800A
------------------------------------------------------------------------------------------------------------------------------------
24               MIV-EXT-    FOS/RD ACCUM   1.0-    G400H    4000    STEP-           1   785S    30        7   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 8.3A
               RESOLUTION AT 3500A
------------------------------------------------------------------------------------------------------------------------------------
EXPOSURE LOGSHEET                                                                                  ID = 2298c            [ 11]
------------------------------------------------------------------------------------------------------------------------------------
 1      |   2   |      3    |  4   |   5   |   6   |    7   |   8   |       9       |10 |   11  |   12    |13 |14|        15
------------------------------------------------------------------------------------------------------------------------------------
  Line  |  Seq  |   Target  |Instr | Oper. | Aper  |Spectral|Central|   Optional    |Num|  Time |   S/N   |Flx|Pr|     Special
 Number | Name  |    Name   |Config| Mode  |or FOV |Element |Waveln.|  Parameters   |Exp|       |Rel. Time|Ref|  |   Requirements
------------------------------------------------------------------------------------------------------------------------------------
25               K280-EXT-   WFC    IMAGE   ALL     F336W            CR-SPLIT=0.5    1   700S              1   1  EARLY ACQ FOR 26-
                 CLUSTER-M31                                         CR-                                          32
                                                                     TOLERANCE=0.2
                                                                     PRE-FLASH=YES
------------------------------------------------------------------------------------------------------------------------------------
26               K280-OFFSET FOS/BL ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 26-28 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 27
                                                                                                                  -28
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
27               K280-EXT-   FOS/BL ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
28               K280-EXT-   FOS/BL ACCUM   1.0-    G130H    1300    STEP-           1   5905S   30        3   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 100A
               RESOLUTION AT 1500A
------------------------------------------------------------------------------------------------------------------------------------
29               K280-OFFSET FOS/RD ACQ/    4.3     MIRROR                           1   24S                   1  SEQ 29-32 NO GAP
                                    BINARY                                                                        ONBOARD ACQ FOR 30
                                                                                                                  -32
     Comments: WILL NEED TO UPDATE EXPOSURE
               TIME FROM WFC EARLY ACQ
               EXPOSURE
------------------------------------------------------------------------------------------------------------------------------------
30               K280-EXT-   FOS/RD ACQ     4.3     MIRROR                           1   70S                   1
                 CLUSTER-M31
     Comments: TO OBTAIN RECORD OF WHERE IN
               CLUSTER OBSERVATION IS MADE.
               INTEGRATION TIME COULD CHANGE,
               DEPENDENT ON ACTUAL FOS
               MEASURES. THIS WILL BE REQUIRED
               AT EACH REPOINTING AT CLUSTER
------------------------------------------------------------------------------------------------------------------------------------
31               K280-EXT-   FOS/RD ACCUM   1.0-    G270H    2700    STEP-           1   1935S   36        5   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 5.5A
               RESOLUTION AT 2800A
------------------------------------------------------------------------------------------------------------------------------------
32               K280-EXT-   FOS/RD ACCUM   1.0-    G400H    4000    STEP-           1   859S    37        7   1
                 CLUSTER-M31                PAIR                     PATT=SINGLE
     Comments: S_TO_N IS CALCULATED FOR 8.3A
               RESOLUTION AT 3500A
------------------------------------------------------------------------------------------------------------------------------------
            Summary Form for Proposal 2298c                                                                              [ 12]

  Item                          Used in this proposal
------------------------------------------------------------------------------------------------------------------------------------
  Configurations                WFC FOS/BL FOS/RD
------------------------------------------------------------------------------------------------------------------------------------
  Opmodes                       IMAGE ACQ/BINARY ACQ ACCUM
------------------------------------------------------------------------------------------------------------------------------------
  Optional Parameters           CR-SPLIT=0.5 CR-TOLERANCE=0.2 PRE-FLASH=YES STEP-PATT=SINGLE
------------------------------------------------------------------------------------------------------------------------------------
  Proposal for                  GO
------------------------------------------------------------------------------------------------------------------------------------
  S/C Hours                     15.00
------------------------------------------------------------------------------------------------------------------------------------
  Scientific Category           GALAXIES & CLUSTERS
------------------------------------------------------------------------------------------------------------------------------------
  Scientific Sub-category       NEARBY GALAXIES
------------------------------------------------------------------------------------------------------------------------------------
  Special Requirements          CYCLE 1 / 1-32; EARLY ACQ FOR 2-8 SEQ 2-4 NO GAP; ONBOARD ACQ FOR 3-4 SEQ 5-8 NO GAP; ONBOARD ACQ
                                FOR 6-8 EARLY ACQ FOR 10-16 SEQ 10-12 NO GAP; ONBOARD ACQ FOR 11-12 SEQ 13-16 NO GAP; ONBOARD ACQ
                                FOR 14-16 EARLY ACQ FOR 18-24 SEQ 18-20 NO GAP; ONBOARD ACQ FOR 19-20 SEQ 21-24 NO GAP; ONBOARD ACQ
                                FOR 22-24 EARLY ACQ FOR 26-32 SEQ 26-28 NO GAP; ONBOARD ACQ FOR 27-28 SEQ 29-32 NO GAP; ONBOARD ACQ
                                FOR 30-32
------------------------------------------------------------------------------------------------------------------------------------
  Spectral Elements             F336W MIRROR G130H G270H G400H
------------------------------------------------------------------------------------------------------------------------------------
  Target Names                  K58-EXT-CLUSTER-M31 V55-EXT-CLUSTER-M31 K58-OFFSET MII-EXT-CLUSTER-M31 K1-EXT-CLUSTER-M31
                                MII-OFFSET MIV-EXT-CLUSTER-M31 K219-EXT-CLUSTER-M31 MIV-OFFSET K280-EXT-CLUSTER-M31
                                V282-EXT-CLUSTER-M31 K280-OFFSET
------------------------------------------------------------------------------------------------------------------------------------