6249( 5) - 09/13/95 09:08 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6249 Version: 5 Check-in Date: ********** 1.Proposal Title: Observations of Interstellar Oxygen ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Interstellar Medium GTO/HRS 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Michael Jura UCLA CoI: David M. Meyer Northwestern University Y CoI: Isabel Hawkins UC-Berkeley N ------------------------------------------------------------------------------------ 6. Abstract We propose to make sensitive observations of the interstellar abundance of oxygen in ten scattered sightlines through the local ISM. The initial observations in this program toward several stars in Orion have found no evidence of density-dependent depletion from the gas-phase for oxygen. The derived total oxygen abundance toward the Orion stars is consistent with stellar and nebular determinations in Orion at a level that is one-half the solar value. It is possible that the O/H abundance ratio is lower in Orion compared to the Sun because the local Milky Way has suffered a recent infall of metal-poor material. Our proposed observations will establish a firm baseline oxygen abundance and scatter with which to further test this hypothesis. ------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 2] Observations Description ------------------------ We propose to obtain GHRS ECH-A data in the LSA (2-4 samples/diode: STEP- PATT=6, 7) on the interstellar O I absorption line at 1355.598 A toward a sample of 10 stars characterized by low column densities of molecular hydrogen in their sightlines. Since the O I line is expected to be very weak with equivalent widths near 1 mA in these sightlines, we require high S/N ratio data (400-700) on each of our targeted stars. Accounting for guide star acquisition, target ACQ, and exposure overhead times, these sensitivities can be attained in the remaining time in a single orbit per target through the judicious use of FP-Split exposures. Real Time Justification ----------------------- None Calibration Justification ------------------------- None Additional Comments ------------------- None ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD5394 STAR, B0-B2 V-IV RA=00H 56M 42.52S +/- 0.03S, J2000 V=2.47 DEC=+60D 43' 00.3" +/- 0.5" B-V=-0.15 2 HD24760 STAR, B0-B2 V-IV RA=03H 57M 51.21S +/- 0.03S, J2000 V=2.89 DEC=+40D 00' 36.9" +/- 0.5" B-V=-0.18 3 HD36486 STAR, MAIN SEQUENCE O RA=05H 32M 00.36S +/- 0.03S, J2000 V=2.23 DEC=-00D 17' 56.7" +/- 0.5" B-V=-0.22 4 HD37128 STAR, B0-B2 III-I RA=05H 36M 12.73S +/- 0.03S, J2000 V=1.70 DEC=-01D 12' 07.0" +/- 0.5" B-V=-0.19 5 HD47839 STAR, MAIN SEQUENCE O RA=06H 40M 58.68S +/- 0.03S, J2000 V=4.66 DEC=+09D 53' 44.5" +/- 0.5" B-V=-0.25 6 HD57061 STAR, SUPERGIANT O RA=07H 18M 42.50S +/- 0.03S, J2000 V=4.40 DEC=-24D 57' 16.0" +/- 0.5" B-V=-0.15 7 HD120324 STAR, B0-B2 V-IV RA=13H 49M 36.90S +/- 0.03S, J2000 V=3.04 DEC=-42D 28' 25.8" +/- 0.5" B-V=-0.17 8 HD136298 STAR, B0-B2 V-IV RA=15H 21M 22.33S +/- 0.03S, J2000 V=3.22 DEC=-40D 38' 51.4" +/- 0.5" B-V=-0.22 9 HD157246 STAR, B0-B2 III-I RA=17H 25M 23.59S +/- 0.03S, J2000 V=3.34 DEC=-56D 22' 39.4" +/- 0.5" B-V=-0.13 10 HD138690 STAR, B0-B2 V-IV RA=15H 35M 08.35S +/- 0.03S, J2000 V=2.78 DEC=-41D 10' 00.0" +/- 0.5" B-V=-0.20 6249( 5) - 09/13/95 09:08 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD5394 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 2-5 SEARCH- SIZE=3,LOCATE=E XTENDED ------------------------------------------------------------------------------------------------------------------------------------ 2 HD5394 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD5394 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 326.4S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 4 HD5394 HRS ACCUM 2.0 ECH-A41 1357.2 FP- 1 326.4S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 5 HD5394 HRS ACCUM 2.0 ECH-A41 1357.7 FP- 1 326.4S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 5] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 6 HD24760 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 7-9 SEARCH- SIZE=3,LOCATE=E XTENDED ------------------------------------------------------------------------------------------------------------------------------------ 7 HD24760 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 345.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 8 HD24760 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 345.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 9 HD24760 HRS ACCUM 2.0 ECH-A41 1357.2 FP- 1 345.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 6] Visit: 03 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 HD36486 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 11-14 SEARCH- SIZE=3,LOCATE=E XTENDED ------------------------------------------------------------------------------------------------------------------------------------ 11 HD36486 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 12 HD36486 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 13 HD36486 HRS ACCUM 2.0 ECH-A41 1357.2 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 14 HD36486 HRS ACCUM 2.0 ECH-A41 1357.7 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 7] Visit: 04 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 15 HD37128 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 16-19 SEARCH- SIZE=3,LOCATE=E XTENDED ------------------------------------------------------------------------------------------------------------------------------------ 16 HD37128 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 17 HD37128 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 18 HD37128 HRS ACCUM 2.0 ECH-A41 1357.2 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 19 HD37128 HRS ACCUM 2.0 ECH-A41 1357.7 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 8] Visit: 05 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 20 HD47839 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 21-22 SEARCH-SIZE=3 ------------------------------------------------------------------------------------------------------------------------------------ 21 HD47839 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 576S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 22 HD47839 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 576S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 9] Visit: 06 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 23 HD57061 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 24-25 SEARCH-SIZE=3 ------------------------------------------------------------------------------------------------------------------------------------ 24 HD57061 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 576S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 25 HD57061 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 576S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 10] Visit: 07 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 26 HD120324 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 27-28 SEARCH- SIZE=3,LOCATE=E XTENDED ------------------------------------------------------------------------------------------------------------------------------------ 27 HD120324 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 633.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 28 HD120324 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 633.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 11] Visit: 08 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 29 HD136298 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 30-32 SEARCH- SIZE=3,LOCATE=E XTENDED ------------------------------------------------------------------------------------------------------------------------------------ 30 HD136298 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 345.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 31 HD136298 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 345.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 32 HD136298 HRS ACCUM 2.0 ECH-A41 1357.2 FP- 1 345.6S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 12] Visit: 09 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 33 HD157246 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 34-35 SEARCH-SIZE=3 ------------------------------------------------------------------------------------------------------------------------------------ 34 HD157246 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 691.2S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 35 HD157246 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 691.2S SPLIT=STD,STEP- PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 13] Visit: 10 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 36 HD138690 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 37-40 SEARCH-SIZE=3 ------------------------------------------------------------------------------------------------------------------------------------ 37 HD138690 HRS ACCUM 2.0 ECH-A41 1356.2 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 38 HD138690 HRS ACCUM 2.0 ECH-A41 1356.7 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 39 HD138690 HRS ACCUM 2.0 ECH-A41 1357.2 FP- 1 217.6S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 40 HD138690 HRS ACCUM 2.0 ECH-A41 1357.7 FP- 1 326.4S SPLIT=STD,STEP- PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ 6249( 5) - 09/13/95 09:08 - [ 14] Summary Form for Proposal 6249 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BRIGHT=RETURN SEARCH-SIZE=3 LOCATE=EXTENDED STEP-PATT=7 FP-SPLIT=STD STEP-PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GTO/HRS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Interstellar Medium ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2-5 ONBOARD ACQ FOR 7-9 ONBOARD ACQ FOR 11-14 ONBOARD ACQ FOR 16-19 ONBOARD ACQ FOR 21-22 ONBOARD ACQ FOR 24-25 ONBOARD ACQ FOR 27-28 ONBOARD ACQ FOR 30-32 ONBOARD ACQ FOR 34-35 ONBOARD ACQ FOR 37-40 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N1 ECH-A41 ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD5394 HD24760 HD36486 HD37128 HD47839 HD57061 HD120324 HD136298 HD157246 HD138690 ------------------------------------------------------------------------------------------------------------------------------------