5460( 14) - 12/06/95 14:18 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5460 Version: 14 Check-in Date: ********** 1.Proposal Title: CONSTRAINTS ON MASSIVE STAR EVOLUTION FROM CARBON AND OXYGEN ABUNDANCES IN LMC WC/WO STARS: CYCLE4HIGH ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle HOT STARS,MASSIVE STA GO 4 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: HILLIER, JOHN UNIVERSITY OF PITTSBURGH ------------------------------------------------------------------------------------ 6. Abstract High signal-to-noise UV FOS spectra of a sample of WC-type Wolf-Rayet stars in the LMC will be obtained to determine C/He and O/C abundance ratios. These abundance ratios will provide urgently required constraints on the He-burning stage of the evolution of massive stars. The surface C/He and O/C abundance ratios in WC stars are influenced by mass loss, convection and overshooting, and the (uncertain) 12C(ALPHA,GAMMA)16O reaction rate. The spectra will be analyzed using sophisticated non-LTE radiative transfer codes which allow for spherical extension and stellar winds, and which incorporate the latest atomic data. Our quantitative analysis will also allow a determination of fundamental stellar parameters (eg Rstar, Teff), abundances of species such as Fe and Si, and accurate mass loss rates. These, and the C and O abundance determinations, will allow much tighter constraints to be placed on the evolution of massive stars. Starburst galaxies are currently an active area of research. Massive stars, including W-R stars, are seen to be playing a key role in the dynamics and evolution of these systems. It is imperative that we understand the evolution and properties of massive stars in the galaxy and LMC (where they are amenable to detailed spectroscopic studies) if we are to make reliable inferences concerning star formation rates, nucleosynthesis yields, and initial mass functions etc in starburst systems. ------------------------------------------------------------------------------------ Observations Description ------------------------ Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5460( 14) - 12/06/95 14:18 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5460( 14) - 12/06/95 14:18 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 BR93 EXT-STAR,WOLF RAYET, RA=5H 39M 33.905S +/- 0.033S, J2000 V = TYPE=W04 DEC= -68D 44' 9.44" +/- 0.50" 280.0 V = 15.4 +/- 0.1 B-V = 0.0 +/- 10.0 E-1 E(B-V) = 4.0 +/- 5.0 E-2 F-CONT(5560.0) = 10.0 +/- 2.0 E-16 F-CONT(2225.0) = 6.0 +/- 2.0 E-15 F-CONT(1690.0) = 12.0 +/- 1.0 E-15 F-CONT(1285.0) = 22.0 +/- 2.0 E-15 Comments: V=16.5 +/- 0.1 E(B-V)=0.03 2 BR93-FIX EXT-STAR,WOLF RAYET, RA=5H 39M 34.47S +/- 0.033S, J2000 V = TYPE=W04 DEC= -68D 44' 9.5" +/- 0.50", 280.0 V = 15.4 +/- 0.1 PLATE-ID=06B0 B-V = 0.0 +/- 10.0 E-1 E(B-V) = 4.0 +/- 5.0 E-2 F-CONT(5560.0) = 10.0 +/- 2.0 E-16 F-CONT(2225.0) = 6.0 +/- 2.0 E-15 F-CONT(1690.0) = 12.0 +/- 1.0 E-15 F-CONT(1285.0) = 22.0 +/- 2.0 E-15 Comments: V=16.5 +/- 0.1 E(B-V)=0.03 11 HD32125 EXT-STAR,WOLF RAYET, RA=4H 56M 11.164S +/- 0.033S, J2000 V = TYPE=WC4 DEC= -66D 17' 33.24" +/- 0.50", 280.0 V = 14.33 +/- 0.1 PLATE-ID=06AF B-V = 4.0 +/- 5.0 E-2 E(B-V) = 10.0 +/- 5.0 E-2 F-CONT(5560.0) = 25.0 +/- 3.0 E-16 F-CONT(2225.0) = 3.2 +/- 0.3 E-14 F-CONT(1690.0) = 6.4 +/- 0.5 E-14 F-CONT(1285.0) = 16.0 +/- 2.0 E-14 Comments: V=15.0 +/- 0.1 E(B-V)=0.08 21 HD269888 EXT-STAR,WOLF RAYET, RA=5H 37M 44.796S +/- 0.033S, J2000 V = TYPE=WC4 DEC= -69D 14' 25.61" +/- 0.50", 280.0 V = 14.78 +/- 0.1 PLATE-ID=05ZW B-V = 0.0 +/- 5.0 E-2 E(B-V) = 20.0 +/- 10.0 E-2 F-CONT(5560.0) = 16.0 +/- 2.0 E-16 F-CONT(2225.0) = 10.0 +/- 3.0 E-15 F-CONT(1690.0) = 26.0 +/- 5.0 E-15 F-CONT(1285.0) = 5.1 +/- 1.0 E-14 Comments: V=15.69 E(B-V)=0.16 5460( 14) - 12/06/95 14:18 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 BR93 FOS/BL ACQ/BIN 4.3 MIRROR BRIGHT=33000.0 1 2.2S ONBOARD ACQ FOR 20 ARY ------------------------------------------------------------------------------------------------------------------------------------ 20 BR93 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 3S ONBOARD ACQ FOR 30 K Y=.172, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.172 ------------------------------------------------------------------------------------------------------------------------------------ 30 BR93 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 3S ONBOARD ACQ FOR 40 K Y=.052, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.052 ------------------------------------------------------------------------------------------------------------------------------------ 40 BR93 FOS/BL ACCUM 0.3 G130H 1 7980S ------------------------------------------------------------------------------------------------------------------------------------ 50 BR93 FOS/BL ACCUM 0.3 G190H 1 3780S ------------------------------------------------------------------------------------------------------------------------------------ 60 BR93 FOS/BL ACCUM 0.3 G270H 1 1200S ------------------------------------------------------------------------------------------------------------------------------------ 5460( 14) - 12/06/95 14:18 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 HD32125 FOS/BL ACQ/BIN 4.3 MIRROR BRIGHT=45000, 1 0.66S ONBOARD ACQ FOR 20 ARY FAINT=870 ------------------------------------------------------------------------------------------------------------------------------------ 20 HD32125 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 1S ONBOARD ACQ FOR 30 K Y=.172, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.172 ------------------------------------------------------------------------------------------------------------------------------------ 30 HD32125 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 1S ONBOARD ACQ FOR 40 K Y=.052, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.052 ------------------------------------------------------------------------------------------------------------------------------------ 40 HD32125 FOS/BL ACCUM 0.3 G130H 1 1500S ------------------------------------------------------------------------------------------------------------------------------------ 50 HD32125 FOS/BL ACCUM 0.3 G190H 1 650S ------------------------------------------------------------------------------------------------------------------------------------ 60 HD32125 FOS/BL ACCUM 0.3 G270H 1 250S ------------------------------------------------------------------------------------------------------------------------------------ 5460( 14) - 12/06/95 14:18 - [ 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 HD269888 FOS/BL ACQ/BIN 4.3 MIRROR BRIGHT=33000.0 1 1S ONBOARD ACQ FOR 20 ARY ------------------------------------------------------------------------------------------------------------------------------------ 20 HD269888 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 2S ONBOARD ACQ FOR 30 K Y=.172, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.172 ------------------------------------------------------------------------------------------------------------------------------------ 30 HD269888 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 2S ONBOARD ACQ FOR 40 K Y=.052, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.052 ------------------------------------------------------------------------------------------------------------------------------------ 40 HD269888 FOS/BL ACCUM 0.3 G130H 1 3600S ------------------------------------------------------------------------------------------------------------------------------------ 50 HD269888 FOS/BL ACCUM 0.3 G190H 1 1380S ------------------------------------------------------------------------------------------------------------------------------------ 60 HD269888 FOS/BL ACCUM 0.3 G270H 1 780S ------------------------------------------------------------------------------------------------------------------------------------ 5460( 14) - 12/06/95 14:18 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 BR93-FIX FOS/BL ACQ/BIN 4.3 MIRROR BRIGHT=33000.0 1 2.2S ONBOARD ACQ FOR 20 ARY ------------------------------------------------------------------------------------------------------------------------------------ 20 BR93-FIX FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 3S ONBOARD ACQ FOR 30 K Y=.172, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.172 ------------------------------------------------------------------------------------------------------------------------------------ 30 BR93-FIX FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP- 1 3S ONBOARD ACQ FOR 40 K Y=.052, SEARCH- SIZE-Y=5, SEARCH-SIZE- X=5, SCAN-STEP- Comments: X=.052 ------------------------------------------------------------------------------------------------------------------------------------ 40 BR93-FIX FOS/BL ACCUM 0.3 G130H 1 7980S ------------------------------------------------------------------------------------------------------------------------------------ 50 BR93-FIX FOS/BL ACCUM 0.3 G190H 1 3780S ------------------------------------------------------------------------------------------------------------------------------------ 60 BR93-FIX FOS/BL ACCUM 0.3 G270H 1 1200S ------------------------------------------------------------------------------------------------------------------------------------ 5460( 14) - 12/06/95 14:18 - [ 8] Summary Form for Proposal 5460 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/BINARY ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BRIGHT=33000.0 SCAN-STEP-X=.172 SCAN-STEP-X=.052 FAINT=870 SEARCH-SIZE-X=5 SEARCH-SIZE-Y=5 SCAN-STEP-Y=.172 SCAN-STEP-Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category HOT STARS,MASSIVE STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 30 ONBOARD ACQ FOR 40 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G130H G190H G270H ------------------------------------------------------------------------------------------------------------------------------------ Target Names BR93 HD32125 HD269888 BR93-FIX ------------------------------------------------------------------------------------------------------------------------------------