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    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID 3372c
                                                       Report Date: 09-May-96:18:33
                                                       Version: **********
                                                       Check-in Date: **********

1.Proposal Title:
GHRS POINT SPREAD FUNCTION DETERMINATION
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2. Scientific Category   3. Proposal For  4. Proposal Type        5. Continuation ID
                            CAL/HRS                                  <none>
Sub Category

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6. Principal Investigator   Institution                    Country    Telephone
 Ronald L. Gilliland        SPACE TELESCOPE SCIENCE INST   USA        301-338-4454

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7. Abstract
Knowledge of the point-spread-function (PSF) for large (LSA) aperture GHRS is
essential for any quantitative analysis of spectra taken through the LSA.  With the
determination that the GHRS has better far UV response than the FOS, coupled with
simulations showing that the LSA is superior to the SSA for detection of weak,
unresolved features, the need for good PSFs has increased in importance.  This is
independent of any deconvolution issues. Deconvolution, which may in some cases be a
useful procedure to apply to LSA spectra, also requires knowledge of the PSF.   Good
SSA PSFs can be derived using calibration lamp spectra and simple modelling.
Unfortunately, GHRS LSA maps have not proven sufficient to derive point-spread-
functions (only N1 picks off the full beam).  The SAO observations of CHI LUPI were
justified as a test of GHRS resolving power, LSA degradation and deconvolution
testing.  Analysis of this data, coupled with many simulations, has shown that the
best approach to deriving the relative PSF difference between the LSA and SSA is by
direct least-squares solution for the PSF relating spectra acquired through the two
apertures.  With a vsini < 1.2 km/sec, CHI LUPI is an ideal target to define PSFs
over the full range of spectral elements.
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8. Scientific Key Words:   CALIBRATION SPECTROSCOPY, UV
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9. Est obs time (hours) pri: 7.70     par: 0       10. Num targs pri: 1      par: 0
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I. GENERAL FORM    Proposal 3372c
PI:  Ronald L. Gilliland
Proposal Title:
GHRS POINT SPREAD FUNCTION DETERMINATION
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1. Proposers:
Proposers                        Institution                       Country       ESA
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 Ron Gilliland                   ST SCI                            USA
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  3. Description of proposed observations.
  Knowledge of the point-spread-function (PSF) for large (LSA) aperture GHRS is
 essential for any quantitative analysis of spectra taken through the LSA.  With
 the determination that the GHRS has better far UV response than the FOS, coupled
 with simulations showing that the LSA is superior to the SSA for detection of
 weak, unresolved features, the need for good PSFs has increased in importance.
 This is independent of any deconvolution issues. will be obtained in the echelle
 and gratings.
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  5. Description of special scheduling requirements.
  Exposure times are selected to yield S/N about 100 for LSA, and 70, or greater,
 for SSA.  These are levels required for adequate extraction of the relative PSF
 relating the two apertures. To achieve the best SSA throughput for these
 observations, they should be scheduled at least 6 weeks after completion CAL/HRS
 3999.
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  7. Data reduction and analysis plans.
   Data will be analysed at the ST ScI using fully developed and tested software.
 (See abstract for brief discussion.)
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 13.
   High signal-to-noise spectra will be obtained through both GHRS apertures at
 three basic wavelengths chosen to:  1) well span the full UV wavelength range
 accessible to the GHRS, and 2) provide scientifically valuable spectra.
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11. Address Information
Name:  RONALD L. GILLILAND                                 Category: PI
Institution: SPACE TELESCOPE SCIENCE INSTITUTE
Address:
City:                                           State:
Zip Code:                                       Country: USA
Telephone: 301-338-4454
Telex (or e-mail):
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TARGET LIST    a) Fixed Targets                                                                    ID = 3372c            [  3]
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 1 |     2      |           3           |              4             |  5     |   6    |  7  |              8
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Tar|   Target   |         Target        |            Target          |Coord   | Radial |Acqui|FLX|     Flux data
No |    Name    |       Description     |           Position         |Eqnx    |  Vel.  |Prblm|REF|
   |            |                       |                            |        |        |     |   |
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1   HD141556 CHI J,704                   RA=15H 47M 46.468S +/- 0.2", 1950     V=+5           1   V=3.95+/-.05, TYPE=BP
    -LUP                                 DEC=-33D 28' 35.36" +/- 0.2"                         2   F-CONT(1362)=1.8 E-10
                                                                                              3   F-CONT(1868)=1.9 E-10
                                                                                              4   F-CONT(2682)=1.0 E-10
     Comments: BP HG MN STAR

   Epoch of Position    RA proper motion (seconds of time/yr)    DEC Proper Motion (arcsec/yr)    Annual Parallax (arcsec)
      1950.00          -0.0006 +/-  0.0007                      -0.0320 +/-  0.0100               0.0000 +/-  0.0000
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EXPOSURE LOGSHEET                                                                                  ID = 3372c            [  4]
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 1      |   2   |      3    |  4   |   5   |   6   |    7   |   8   |       9       |10 |   11  |   12    |13 |14|        15
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  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
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1                HD141556    HRS    ACQ     2.0     MIRROR-A2        SEARCH-SIZE=5   1   5.0S    10        1   1  ONBOARD ACQ FOR
                                                                     FAINT=1900                                   1.001
                                                                                                                  CYCLE 1/ 1-17
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1.001            HD141556    HRS    ACQ/    2.0     MIRROR-A2                        1   73.6S   10        1   1  ONBOARD ACQ FOR
                                    PEAKUP                                                                        1.002-11.00
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1.002            HD141556    HRS    IMAGE   2.0     MIRROR-A2        NX=32           1   102.4S  10        4   1
                                                                     NY=16
                                                                     DELTA-X=2
                                                                     DELTA-Y=4
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2                HD141556    HRS    ACCUM   2.0     ECH-B21  2682    STEP-PATT=7     1   326.4S  96        4   1  SEQ 2-17 NO GAP
                                                                     FP-SPLIT=STD
     Comments: SENS=1.19E12 S/
               N=SQRT(FLUX*SENS*NUM_EXP
               *TIME_PER_EXP*0.94/4)
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3                HD141556    HRS    ACCUM   2.0     ECH-B30  1868    STEP-PATT=7     3   435.2S  95        3   1
                                                                     FP-SPLIT=STD
     Comments: SENS=1.56E11
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4                HD141556    HRS    ACCUM   2.0     G270M    2688    STEP-PATT=5     1   108.8S  110       4   1
                                                                     FP-SPLIT=STD
     Comments: SENS=4.70E12
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5                HD141556    HRS    ACCUM   2.0     G200M    1860    STEP-PATT=5     1   326.4S  113       3   1
                                                                     FP-SPLIT=STD
     Comments: SENS=8.80E11
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6                HD141556    HRS    ACCUM   2.0     G160M    1860    STEP-PATT=5     1   435.2S  102       3   1
                                                                     FP-SPLIT=STD
     Comments: SENS=5.40E11
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7                HD141556    HRS    ACCUM   2.0     G160M    1360.5  STEP-PATT=5     1   435.2S  104       2   1
                                                                     FP-SPLIT=STD
     Comments: SENS=5.82E11
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11               HD141556    HRS    ACQ/    2.0     MIRROR-A2                        1   73.6S   10        1   1  ONBOARD ACQ FOR
                                    PEAKUP                                                                        12.00-17.00
     Comments: STEP-TIME=1.6 SEC
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12               HD141556    HRS    ACCUM   0.25    ECH-B21  2682    STEP-PATT=7     2   435.2S  90        4   1
                                                                     FP-SPLIT=STD
     Comments: LSA/SSA(2682)=3.0
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13               HD141556    HRS    ACCUM   0.25    ECH-B30  1868    STEP-PATT=7     6   435.2S  71        3   1
                                                                     FP-SPLIT=STD
     Comments: LSA/SSA(1868)=3.6
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14               HD141556    HRS    ACCUM   0.25    G270M    2688    STEP-PATT=5     1   217.6S  90        4   1
                                                                     FP-SPLIT=STD
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EXPOSURE LOGSHEET                                                                                  ID = 3372c            [  5]
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 1      |   2   |      3    |  4   |   5   |   6   |    7   |   8   |       9       |10 |   11  |   12    |13 |14|        15
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  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
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15               HD141556    HRS    ACCUM   0.25    G200M    1860    STEP-PATT=5     2   435.2S  97        3   1
                                                                     FP-SPLIT=STD
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16               HD141556    HRS    ACCUM   0.25    G160M    1860    STEP-PATT=5     4   435.2S  108       3   1
                                                                     FP-SPLIT=STD
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17               HD141556    HRS    ACCUM   0.25    G160M    1360.5  STEP-PATT=5     4   435.2S  100       2   1
                                                                     FP-SPLIT=STD
     Comments: LSA/SSA(1360)=4.2
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            Summary Form for Proposal 3372c                                                                              [  6]

  Item                          Used in this proposal
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  Configurations                HRS
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  Opmodes                       ACQ ACQ/PEAKUP IMAGE ACCUM
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  Optional Parameters           SEARCH-SIZE=5 FAINT=1900 NX=32 NY=16 DELTA-X=2 DELTA-Y=4 STEP-PATT=7 FP-SPLIT=STD STEP-PATT=5
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  Proposal for                  CAL/HRS
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  S/C Hours                     7.70
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  Scientific Category          <none>
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  Scientific Sub-category      <none>
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  Special Requirements          ONBOARD ACQ FOR 1.001; CYCLE 1/ 1-17; ONBOARD ACQ FOR 1.002-11.00; SEQ 2-17 NO GAP ONBOARD ACQ FOR
                                12.00-17.00
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  Spectral Elements             MIRROR-A2 ECH-B21 ECH-B30 G270M G200M G160M
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  Target Names                  HD141556 CHI-LUP
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