Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 24 Report Date: 18-Jul-95:16:16 Version: ********** Check-in Date: ********** 1.Proposal Title: COMPOSITION OF GAS IN INDIVIDUAL INTERSTELLAR CLOUDS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID INTERSTELLAR MEDIUM GO Sub Category ABSORPTION LINES ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr. Joe Astronomer STSCI USA (301) 338-4700 ASTRONOMER ------------------------------------------------------------------------------------ 7. Abstract Column densities of interstellar atoms of some ten atomic species will be measured in the line of sight an early-type star, using the High-Resolution Spectrograph to obtain precise measures in the ultraviolet with highest spectral resolution. These data will be analyzed to determine relative abundances in the several individual clouds present along each line of sight, and thus to determine how the composition of the gas in such clouds varies with cloud parameters such as H column density, velocity, ionization level and distance z from the galactic plane. This information should help to clarify the equilibrium between gas and grains,--i.e., how the gas condenses on the grains and how the grains are destroyed by a variety of phenomena occurring in interstellar clouds. ------------------------------------------------------------------------------------ 8. Scientific Key Words: INTERSTELLAR LINES ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 20.00 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HRS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 24 PI: Dr. Joe Astronomer Proposal Title: COMPOSITION OF GAS IN INDIVIDUAL INTERSTELLAR CLOUDS ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Dr. Joe Astronomer SPACE TELESCOPE SCIENCE USA INSTITUTE ------------------------------------------------------------------------------------ 3. Description of proposed observations. For HD93521, a series of interstellar absorption lines will be observed, using the Echelle mode of the High Resolution Spectrograph in the WSCAN mode. Three different lines will be scanned, with 3 spectra obtained for each line. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. Justification for use of HST goes here (optional). ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. Justification for realtime data or special scheduling goes here. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. A WAVE observation will be obtained in order to check the default calibration. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. A description of your data reduction plans go here. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. Any additional comments go here. ------------------------------------------------------------------------------------ 9. Description of previous HST work. A description of any previous HST data goes here. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Resources provided by your home institution goes here. ------------------------------------------------------------------------------------ 11. Address Information Name: JOE ASTRONOMER Category: PI Institution: STSCI Address: 3700 SAN MARTIN DRIVE City: BALTIMORE State: MD Zip Code: 21218 Country: USA Telephone: (301) 338-4700 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 24 [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 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 HD93521 A,104 PLATE-ID=1HN5, 2000 1 V=7.04,E(B-V)=0.02 RA=10H 45M 33.60S +/- .1S, 2 F-CONT(1300)=3.2+/-0.9E-10 DEC=37D 50' 4.5" +/- 1.0" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 24 [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 DEFINE # HRS WSCAN 0.25 ECH-B 1804.92 STEP-PATT=DEF 1 27S # 2 # BR-1 - COMB=TWO 1807.08 WAVE-STEP=0.72 Comments: "WAVE-STEP" IN COLUMN 9 OF LINE 10 IS EQUIVALENT TO 3 SPECTRA CENTERED AT 1805.28A, 1806.00A, AND 1806.72A. ------------------------------------------------------------------------------------------------------------------------------------ 11 DEFINE # HRS WSCAN 0.25 ECH-B 2368.98 STEP-PATT=DEF 1 15S # 2 # BR-1 - COMB=TWO 2371.62 WAVE-STEP=0.88 Comments: "WAVE-STEP" IN COLUMN 9 OF LINE 11 IS EQUIVALENT TO 3 SPECTRA CENTERED AT 2369.42A, 2370.30A, AND 2371.18A. ------------------------------------------------------------------------------------------------------------------------------------ 12 DEFINE # HRS WSCAN 0.25 ECH-B 2600.71 STEP-PATT=DEF 1 24S # 1 # BR-1 - COMB=TWO 2603.50 WAVE-STEP=0.93 Comments: "WAVE-STEP" IN COLUMN 9 OF LINE 12 IS EQUIVALENT TO 3 SPECTRA CENTERED AT 2601.18A, 2602.11A, AND 2603.04A. ------------------------------------------------------------------------------------------------------------------------------------ 17 HD93521 HRS ACQ 2.0 MIRROR-A2 FAINT=1200 1 57.8S 2 ONBOARD LOCATE=YES ACQUISITION FOR 18 MAP=END-POINT SEQ 17-20 NO GAP SEARCH-SIZE=5 CYCLE 0 / 17-20 ------------------------------------------------------------------------------------------------------------------------------------ 18 HD93521 HRS ACQ/ 2.0 MIRROR-A2 1 9.2S 2 ONBOARD ACQ FOR 19 PEAKUP Comments: STEP-TIME=0.2 SEC. ------------------------------------------------------------------------------------------------------------------------------------ 19 USE BR- HD93521 X16.0 32 2 1 Comments: THE MULTIPLICATIVE FACTOR 16 FOR ALL BR-1 EXPOSURES FOR THIS STAR HAS BEEN CALCULATED TO GIVE S/N=32 FOR THE HST FLUX AS REDUCED BY SPHERICAL ABERRATION. ------------------------------------------------------------------------------------------------------------------------------------ 20 WAVE HRS ACCUM SC1 ECH-B 2603.03 STEP-PATT=DEF 1 10S 2 COMB=TWO ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 24 [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes WSCAN ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters STEP-PATT=DEF COMB=TWO WAVE-STEP=0.72 WAVE-STEP=0.88 WAVE-STEP=0.93 FAINT=1200 LOCATE=YES MAP=END-POINT SEARCH-SIZE=5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 20.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category INTERSTELLAR MEDIUM ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ABSORPTION LINES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQUISITION FOR 18; SEQ 17-20 NO GAP; CYCLE 0 / 17-20; ONBOARD ACQ FOR 19; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements ECH-B MIRROR-A2 ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD93521 ------------------------------------------------------------------------------------------------------------------------------------