5891( 10) - 02/14/96 11:29 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5891 Version: 10 Check-in Date: 14-Feb-1996 11:15:27 1.Proposal Title: Structurally Resolved Abundances and Depletions in the Rho Oph Cloud ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Interstellar Medium GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. C. Gregory Seab University of New Orleans CoI: Dr. Theodore P. Snow Center for Astrophysics and Space N Astronomy ------------------------------------------------------------------------------------ 6. Abstract The mechanism that determines the pattern of depletion of elements in the interstellar medium has been a problem for a long time. It is clear that some of the most refractory elements such as Si, Fe, and Mg, are heavily depleted onto the interstellar grains. On the other hand, some elements such as S and Zn are normally either undepleted or very lightly depleted. The difference between the two cases is not understood. We propose to address this question with a detailed study of the depletion patterns in the Rho Ophiuchi cloud. This study is strongly based on a combination of the capabilities of two modern instruments: the GHRS for high- resolution UV data, and the Ultra High Resolution Facility (UHRF) of the AAT. This instrument has been used to obtain Na I line profiles in the Rho Oph cloud with a resolution of R=1,000,000. The combination of these two types of data will be used to resolve the velocity structure of the element depletions in the cloud. ------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 2] Observations Description ------------------------ Several target stars have been selected in the Rho Oph cloud for study. These targets exhibit a considerable range in extinction (from E_B-V=0.16 for HD143275 to E_B-V=0.48 for Rho Oph itself), as well as some remarkably different grain extinction properties. Since the project is looking for patterns of depletions, then this range in line-of-sight characteristics is highly desirable. For each target, 11 absorption lines from 5 ions are sought. These are: Zn II 2026 and 2062 Angstrom; S II 1250, 1253, and 1259 Angstrom; Si II 1808 Angstrom; Fe II 1608, 2374, and 2586 Angstrom; and Mg II 1239, 1240 Angstrom doublet. The highest possible resolution is sought, so that the Echelle mode will be employed on both sides. Most of the target stars are very bright, so that very high S/N can be achieved. For these targets, only two- three orbits are needed; the occultation time will be used for switching from the ECH-A to the ECH-B mode. Only Rho Oph itself needs exposure times longer than this; we estimate that 4 orbits on this target will get S/N ratios between 100 and 150 for all lines. Real Time Justification ----------------------- No special requirments. Calibration Justification ------------------------- Additional Comments ------------------- The supporting observations, consisting of super high resolution Na I profiles for the target stars in the Rho Oph cloud, have already been completed for four stars in the cloud (Rho Oph = HD147933, Sigma Sco = HD147165, and Delta Sco = HD143275, and PI Sco = HD143018). Similar data from the AAT will be sought for additional stars in the cloud for future study. In addition, one of us (TPS) is a Guest Investigator with the Hipparcos astrometric mission for the purpose of obtaining accurate parallaxes of the stars in the Rho Oph cloud. These data, already obtained, will become available in 1995 or 1996, and will allow us to develop a three-dimensional map of the star locations within the cloud. It will be extremely useful to combine this with the data on cloud structure and physical processes to be obtained from the proposed HST observations. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD147933A STAR,B0-B2 V-IV RA = 16H 25M 35.17S +/- 0.01S, J2000 V = 5.2 DEC = -23D 26' 49.9" +/- 0.1" TYPE=B2IV E(B-V) = 0.48 Comments: rho Oph cloud; Coordinates are from Hipparcos INCA, Vol. 6 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.000 -0.0005 -0.021 0.0 2 HD143275 STAR,B0-B2 V-IV RA = 16H 00M 20.01S +/- 0.01S, J2000 V = 2.28 DEC = -22D 37' 18.0" +/- 0.1" TYPE=B0.5IV E(B-V) = 0.16 Comments: rho Oph cloud; Coordinates are from Hipparcos INCA Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.000 -0.0007 -0.025 0.0 3 HD147165 STAR,B0-B2 III-I RA = 16H 21M 11.30S +/- 0.01S, J2000 V = 3.1 DEC = -25D 35' 34.2" +/- 0.1" TYPE=B1III E(B-V) = 0.40 Comments: rho Oph cloud; Coordinates are from Hipparcos INCA Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.000 -0.0007 -0.023 0.0 5891( 10) - 02/14/96 11:29 - [ 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 HD147933A HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN,L 1 1.8S ONBOARD ACQuisition FOR 2 OCATE=YES,SEARC H-SIZE=3 Comments: STEP-TIME=0.2S; EXPECT 50,000 COUNTS IN STEP- TIME ------------------------------------------------------------------------------------------------------------------------------------ 2 HD147933A HRS ACQ/PEA 0.25 MIRROR-N1 SEARCH-SIZE=5 1 5.0S ONBOARD ACQuisition FOR 3-12 KUP Comments: STEP-TIME=0.2S; EXPECT 25,000 COUNTS IN STEP- TIME ------------------------------------------------------------------------------------------------------------------------------------ 3 HD147933A HRS ACCUM 0.25 ECH-A 1240 STEP- 1 652.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 4 HD147933A HRS ACCUM 0.25 ECH-A 1252 STEP- 1 652.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5 HD147933A HRS ACCUM 0.25 ECH-A 1259 STEP- 1 652.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 6 HD147933A HRS ACCUM 0.25 ECH-A 1608 STEP- 1 979.2S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 7 HD147933A HRS ACCUM 0.25 ECH-B 1808 STEP- 1 1088.0S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 8 HD147933A HRS ACCUM 0.25 ECH-B 2026 STEP- 1 652.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR Comments: split to keep t<4x5M ------------------------------------------------------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 9 HD147933A HRS ACCUM 0.25 ECH-B 2026.5 STEP- 1 652.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR Comments: split to keep t<4x5M ------------------------------------------------------------------------------------------------------------------------------------ 10 HD147933A HRS ACCUM 0.25 ECH-B 2062 STEP- 1 1088.0S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 11 HD147933A HRS ACCUM 0.25 ECH-B 2374 STEP- 1 652.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 12 HD147933A HRS ACCUM 0.25 ECH-B 2586 STEP- 1 326.4S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 6] 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 HD143275 HRS ACQ 2.0 MIRROR-A1 BRIGHT=RETURN,L 1 9S ONBOARD ACQuisition FOR 2 OCATE=YES,SEARC H-SIZE=3 Comments: STEP-TIME=1.0S; EXPECT 6500 COUNTS IN STEP- TIME ------------------------------------------------------------------------------------------------------------------------------------ 2 HD143275 HRS ACQ/PEA 0.25 MIRROR-A1 SEARCH-SIZE=5 1 25.0S ONBOARD ACQuisition FOR 3 KUP Comments: STEP-TIME=1.0S; EXPECT 5000 COUNTS IN STEP- TIME ------------------------------------------------------------------------------------------------------------------------------------ 3 HD143275 HRS ACQ/PEA 0.25 MIRROR-A1 SEARCH-SIZE=5 1 25.0S ONBOARD ACQuisition FOR 4-11 KUP Comments: STEP-TIME=1.0S; EXPECT 5000 COUNTS IN STEP- TIME ------------------------------------------------------------------------------------------------------------------------------------ 4 HD143275 HRS ACCUM 0.25 ECH-A 1239 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5 HD143275 HRS ACCUM 0.25 ECH-A 1239.5 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 6 HD143275 HRS ACCUM 0.25 ECH-A 1251 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 7 HD143275 HRS ACCUM 0.25 ECH-A 1252 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 8 HD143275 HRS ACCUM 0.25 ECH-A 1258 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 9 HD143275 HRS ACCUM 0.25 ECH-A 1259 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 HD143275 HRS ACCUM 0.25 ECH-A 1608 STEP- 1 326.4S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 11 HD143275 HRS ACCUM 0.25 ECH-A 1609 STEP- 1 326.4S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 8] 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 HD143275 HRS ACQ 2.0 MIRROR-A2 BRIGHT=RETURN,L 1 1.8S ONBOARD ACQuisition FOR 2 OCATE=YES,SEARC H-SIZE=3 Comments: STEP-TIME=0.2S; EXPECT 50,000 COUNTS IN STEP- TIME ------------------------------------------------------------------------------------------------------------------------------------ 2 HD143275 HRS ACQ/PEA 0.25 MIRROR-A2 SEARCH-SIZE=5 1 5.0S ONBOARD ACQuisition FOR 11-20 KUP Comments: STEP-TIME=0.2S; EXPECT 25,000 COUNTS IN STEP- TIME ------------------------------------------------------------------------------------------------------------------------------------ 11 HD143275 HRS ACCUM 0.25 ECH-B 1808 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 12 HD143275 HRS ACCUM 0.25 ECH-B 1809 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 13 HD143275 HRS ACCUM 0.25 ECH-B 2026 STEP- 1 217.6S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 14 HD143275 HRS ACCUM 0.25 ECH-B 2027 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 15 HD143275 HRS ACCUM 0.25 ECH-B 2062 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 16 HD143275 HRS ACCUM 0.25 ECH-B 2063 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 17 HD143275 HRS ACCUM 0.25 ECH-B 2374 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 9] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 18 HD143275 HRS ACCUM 0.25 ECH-B 2375 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 19 HD143275 HRS ACCUM 0.25 ECH-B 2586 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 20 HD143275 HRS ACCUM 0.25 ECH-B 2587 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 10] 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 HD147165 HRS ACQ 2.0 MIRROR-N1 BRIGHT=RETURN,L 1 1.8S ONBOARD ACQuisition FOR 2 OCATE=YES,SEARC H-SIZE=3 Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 2 HD147165 HRS ACQ/PEA 0.25 MIRROR-N1 SEARCH-SIZE=5 1 5.0S ONBOARD ACQuisition FOR 3-8 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 3 HD147165 HRS ACCUM 0.25 ECH-A 1239 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5 HD147165 HRS ACCUM 0.25 ECH-A 1251 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 7 HD147165 HRS ACCUM 0.25 ECH-A 1258 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 8 HD147165 HRS ACCUM 0.25 ECH-A 1608 STEP- 1 108.8S PATT=DEF,FP- SPLIT=FOUR,COMB =FOUR ------------------------------------------------------------------------------------------------------------------------------------ 5891( 10) - 02/14/96 11:29 - [ 11] Summary Form for Proposal 5891 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BRIGHT=RETURN LOCATE=YES SEARCH-SIZE=3 SEARCH-SIZE=5 COMB=FOUR FP-SPLIT=FOUR STEP-PATT=DEF ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Interstellar Medium ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQuisition FOR 2 ONBOARD ACQuisition FOR 3-12 ONBOARD ACQuisition FOR 3 ONBOARD ACQuisition FOR 4-11 ONBOARD ACQuisition FOR 11-20 ONBOARD ACQuisition FOR 3-8 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N1 ECH-A ECH-B MIRROR-A1 MIRROR-A2 ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD147933A HD143275 HD147165 ------------------------------------------------------------------------------------------------------------------------------------