6077( 0) - 07/18/95 19:51 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6077 Version: ********** Check-in Date: ********** 1.Proposal Title: Boron abundances in Orion and boron production in Type II Supernovae ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Hot Stars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. David L. Lambert University of Texas at Austin CoI: Dr. Katia Cunha University of Texas at Austin N CoI: Dr. D.R. Gies Georgia State University N CoI: Dr. Lewis Roberts Georgia State University N CoI: Dr. M. Lemke University of Cambridge N ------------------------------------------------------------------------------------ 6. Abstract The Orion OB1 association comprises four subgroups of differing ages. The youngest stars show higher oxygen abundances than the oldest stars. This enrichment has been shown to be due to contamination of the natal gas by oxygen- rich ejecta from supernovae. The boron abundance will be derived from the B II 1362 Angstrom line for three stars in the Orion OB1 association having different oxygen abundances. A positive correlation of the boron and oxygen abundance will, if present, indicate that boron, as ^11B, is synthesized by the supernovae held responsible for the oxygen abundances. This will be the first direct evidence for ^11B production by supernovae. ------------------------------------------------------------------------------------ 6077( 0) - 07/18/95 19:51 - [ 2] Observations Description ------------------------ The B II resonance line at 1362.46 A will be observed with GHRS in the same way as we observed our first target in Cycle 3: G160M grating centered at 1362.5 A and used with the Small Science Aperture (for best spectral resolution) and the A2 mirror for target acquisition. With this arrangement we cover some 35 A of spectra which includes several other Si III lines needed to estimate line blending near the B II line. We are aiming to achieve a high signal-to-noise (about 600-1000 per pixel) similar to what we obtained on the first target in Cycle 3. Exposure times (below) were calculated from the UV fluxes measured in TD1 and IUE spectra of the targets. Our proposed targets have low projected rotational velocities (V sin i), as well as effective temperatures low enough so that the B II transition can be accurately measured. A list of the stars, with their respective effective temperatures, gravities, O abundances, UV fluxes, and exposure times, is given below. Target Teff log g O Abundance Flux (1362 A) Exposure (min.) HD35039 20550 3.74 O-normal 1.2e-9 35 HD36285 21930 4.40 O 60% above 3.6e-10 40 HD36430 19640 4.36 O 50% above 3.5e-10 40 Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- We would prefer to have all targets observed during one suite of observations. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6077( 0) - 07/18/95 19:51 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD35039 STAR, B0-B2 V-IV RA=05H 21M 45.74S +/- 0.01S, J2000 V = 29 V = 4.69 DEC=-00D 22' 57.0" +/- 0.1" B-V = -0.17 +/- 0.02 TYPE = B2IV-V F-CONT(1362) = 1.2 +/- 0.2 E-9 Comments: O-NORMAL, Coordinates are from Hipparcos INCA Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0003 -0.001 0.002 2 HD36285 STAR, B0-B2 V-IV RA=05H 30M 20.75S +/- 0.01S, J2000 V = 11 V = 6.33 +/- 0.02 DEC=-07D 26' 5.3" +/- 0.1" B-V = -0.19 +/- 0.02 TYPE = B2IV-V F-CONT(1362) = 3.6 +/- 0.5 E-10 Comments: O+60%, Coordinates are from Hipparcos INCA Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0013 0.000 0.002 3 HD36430 STAR, B0-B2 V-IV RA=05H 31M 20.92S +/- 0.01S, J2000 V = 23 V = 6.19 DEC=-06D 42' 30.0" +/- 0.1" B-V = -0.17 +/- 0.02 TYPE = B2V F-CONT(1362) = 3.5 +/- 0.5 E-10 Comments: O+50%, Coordinates are from Hipparcos INCA Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0003 0.000 0.002 6077( 0) - 07/18/95 19:51 - [ 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 HD35039 HRS ACQ 2.0 MIRROR-A2 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 2 SEARCH-SIZE=3 Comments: IN ACQ EXPECT ABOUT 66000 CTS/S, STEP- TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 2 HD35039 HRS ACQ/PEA 0.25 MIRROR-A2 SEARCH-SIZE=5 1 5S ONBOARD ACQ FOR 3 KUP Comments: IN ACQ EXPECT ABOUT 44000 CTS/S, STEP- TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 3 HD35039 HRS ACCUM 0.25 G160M 1362.0 FP-SPLIT=STD, 8 327S COMB=FOUR, STEP -PATT=DEF, DOPPLER=DEF, STEP-TIME=0.2 Comments: EXPECTED COUNT RATE = 480, EXPECTED S/N = 1080 ------------------------------------------------------------------------------------------------------------------------------------ 6077( 0) - 07/18/95 19:51 - [ 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 HD36285 HRS ACQ 2.0 MIRROR-A2 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 2 SEARCH-SIZE=3 Comments: IN ACQ EXPECT ABOUT 22000 CTS/S, STEP- TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 2 HD36285 HRS ACQ/PEA 0.25 MIRROR-A2 SEARCH-SIZE=5 1 5S ONBOARD ACQ FOR 3 KUP Comments: IN ACQ EXPECT ABOUT 15000 CTS/S, STEP- TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 3 HD36285 HRS ACCUM 0.25 G160M 1362.0 FP-SPLIT=STD, 8 327S COMB=FOUR, STEP -PATT=DEF, DOPPLER=DEF, STEP-TIME=0.2 Comments: EXPECTED COUNT RATE = 140, EXPECTED S/N = 600 ------------------------------------------------------------------------------------------------------------------------------------ 6077( 0) - 07/18/95 19:51 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 HD36430 HRS ACQ 2.0 MIRROR-A2 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 2 SEARCH-SIZE=3 Comments: IN ACQ EXPECT ABOUT 20000 CTS/S, STEP- TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 2 HD36430 HRS ACQ/PEA 0.25 MIRROR-A2 SEARCH-SIZE=5 1 5S ONBOARD ACQ FOR 3 KUP Comments: IN ACQ EXPECT ABOUT 13000 CTS/S, STEP- TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 3 HD36430 HRS ACCUM 0.25 G160M 1362.0 FP-SPLIT=STD, 8 327S COMB=FOUR, STEP -PATT=DEF, DOPPLER=DEF, STEP-TIME=0.2 Comments: EXPECTED COUNT RATE = 140, EXPECTED S/N = 600 ------------------------------------------------------------------------------------------------------------------------------------ 6077( 0) - 07/18/95 19:51 - [ 7] Summary Form for Proposal 6077 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BRIGHT=RETURN SEARCH-SIZE=3 SEARCH-SIZE=5 STEP-TIME=0.2 DOPPLER=DEF STEP-PATT=DEF ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Hot Stars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2 ONBOARD ACQ FOR 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-A2 G160M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD35039 HD36285 HD36430 ------------------------------------------------------------------------------------------------------------------------------------