5860( 7) - 12/11/95 13:51 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5860 Version: 7 Check-in Date: ********** 1.Proposal Title: Detection of ^11B/^10B and Galactic Chemical Evolution ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Cool Stars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Douglas Duncan University of Chicago CoI: Sveneric Johansson Lund University N CoI: Julie Thorburn Yerkes Observatory // Williams Bay, WI N 53191 CoI: David Schramm University of Chicago N CoI: Brian Fields University of Chicago N ------------------------------------------------------------------------------------ 6. Abstract We propose to use the GHRS in echelle mode to resolve the isotopic splitting of the ^11B and ^10B features at 2090Angstrom. These lines have been observed in the laboratory by one of us (Johansson) to be split by 25mAngstrom, the echelle resolution of GHRS, and we demonstrate that detection is possible. HST B obs. are now used as key data in models of galactic chemical evolution, under the assumption that the B comes from cosmic ray (CR) spallation. This is likely, but not certain (e.g. Duncan, Lambert, Lemke 1992). Woosley et al. (1990) suggest that B may be directly produced in supernovae. No simple models of galactic evolution reproduce both light element (Li, Be, and B) evolution and Fe and O evolution well at the same time. Since the predictions of spallation are quite exact as to isotopic composition, a few or even one observation of the B isotope ratio outside the solar system (the only place ^11B/^10B has been observed) would be an enormous help to constrain theory. A similar detection has been achieved by one of us (Thorburn) for the isotope ^6Li in a halo star. Our program is carefully optimized as to target stars. Since the solar system ^11B/^10B ratio does not match theory, we suggest (first) observing bright solar- metallicicty and intermed metal-poor stars. There high S/N can be achieved and B isotope ratio is predicted to have a large change. More metal-poor stars should follow. ------------------------------------------------------------------------------------ 5860( 7) - 12/11/95 13:51 - [ 2] Observations Description ------------------------ ONE OBJECT WAS DISALLOWED. NOW THERE ARE TWO: All three objects have been extensively observed by IUE near 2090Angstrom and by HST at other wavelengths. The fluxes near 2090Angstrom are well known and the exposure times relatively precise. For example, we scaled the exposures of HD76932 from our own GHRS med. resolution observations near 2500Angstrom by the ratio of the different grating sensitivities at the different wavelengths, to achieve S/N ~ 110. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5860( 7) - 12/11/95 13:51 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD102870 STAR,F3-F9 RA=11H 50M 41.68S +/- 0.1S, DEC= J2000 V=3.60 +/- 0.02 01D 45'52.6" +/- 0.5" B-V=0.55 +/- .02 TYPE=F9V F-CONT(2090) = 2.0 +/- 1.0 E-11 Comments: REQUEST THAT THIS TARGET REPLACE ORIGINAL TARGET 1 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 .0495 -0.272 .104 3 HD76932 STAR,F3-F9 RA=8H 058M 43.95S +/- 0.1S, DEC= J2000 V=5.86 +/- 0.02 -16D 07'58.0" +/- 0.5" B-V=0.44 +/- .02 TYPE=F5 IV-V F-CONT(2090) = 2.0 +/- 1.0 E-12 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 .0162 .214 0.0 5860( 7) - 12/11/95 13:51 - [ 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 HD102870 HRS ACQ 2.0 MIRROR-N2 1 1.8S ONBOARD ACQ FOR 2 Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 2 HD102870 HRS ACQ/PEA 0.25 MIRROR-N2 1 5S ONBOARD ACQ FOR 3-4 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE HRS ACCUM SC2 ECH-B 2089.3 SPYBAL=YES 1 27.2S Comments: STEP-TIME=0.2S,SPYBAL should get done before this WAVEcal ------------------------------------------------------------------------------------------------------------------------------------ 4 HD102870 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 3 1196.8S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 5860( 7) - 12/11/95 13:51 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 HD76932 HRS ACQ 2.0 MIRROR-N2 1 1.8S ONBOARD ACQ FOR 2 Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 2 HD76932 HRS ACQ/PEA 0.25 MIRROR-N2 1 5S ONBOARD ACQ FOR 3-16 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE HRS ACCUM SC2 ECH-B 2089.3 SPYBAL=YES 1 27.2S Comments: STEP-TIME=0.2S,SPYBAL should get done before this WAVEcal ------------------------------------------------------------------------------------------------------------------------------------ 4 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 1 870.4S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 5 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1305.6S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE HRS ACCUM SC2 ECH-B 2089.3 SPYBAL=YES 1 27.2S Comments: STEP-TIME=0.2S,SPYBAL should get done before this WAVEcal ------------------------------------------------------------------------------------------------------------------------------------ 7 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1088S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 8 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1305.6S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 9 WAVE HRS ACCUM SC2 ECH-B 2089.3 SPYBAL=YES 1 27.2S Comments: STEP-TIME=0.2S,SPYBAL should get done before this WAVEcal ------------------------------------------------------------------------------------------------------------------------------------ 10 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1088S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 11 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1305.6S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 12 WAVE HRS ACCUM SC2 ECH-B 2089.3 SPYBAL=YES 1 27.2S Comments: STEP-TIME=0.2S,SPYBAL should get done before this WAVEcal ------------------------------------------------------------------------------------------------------------------------------------ 5860( 7) - 12/11/95 13:51 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 13 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1088S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 14 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1305.6S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 15 WAVE HRS ACCUM SC2 ECH-B 2089.3 SPYBAL=YES 1 27.2S Comments: STEP-TIME=0.2S,SPYBAL should get done before this WAVEcal ------------------------------------------------------------------------------------------------------------------------------------ 16 HD76932 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 2 1196.8S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 5860( 7) - 12/11/95 13:51 - [ 7] 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 HD102870 HRS ACQ 2.0 MIRROR-N2 1 1.8S ONBOARD ACQ FOR 2 Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 2 HD102870 HRS ACQ/PEA 0.25 MIRROR-N2 1 5S ONBOARD ACQ FOR 3-4 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE HRS ACCUM SC2 ECH-B 2089.3 SPYBAL=YES 1 27.2S Comments: STEP-TIME=0.2S,SPYBAL should get done before this WAVEcal ------------------------------------------------------------------------------------------------------------------------------------ 4 HD102870 HRS ACCUM 0.25 ECH-B 2089.3 SPYBAL=NO FP- 3 1196.8S SPLIT=STD Comments: Carrousel not to move ------------------------------------------------------------------------------------------------------------------------------------ 5860( 7) - 12/11/95 13:51 - [ 8] Summary Form for Proposal 5860 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SPYBAL=YES SPYBAL=NO FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Cool Stars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2 ONBOARD ACQ FOR 3-4 ONBOARD ACQ FOR 3-16 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 ECH-B ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD102870 WAVE HD76932 ------------------------------------------------------------------------------------------------------------------------------------