Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5723 Report Date: 18-Jul-95:17:53 Version: ********** Check-in Date: ********** 1.Proposal Title: CONSTRAINTS ON MASSIVE STAR EVOLUTION FROM CARBON AND OXYGEN ABUNDANCES IN LMC WC STARS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID HOT STARS GO/CAR 4550 Sub Category MASSIVE STARS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone John D Hillier UNIVERSITAT MUENCHEN GERMANY ------------------------------------------------------------------------------------ 7. 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. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 13.28 par: 0 10. Num targs pri: 4 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5723 PI: John D Hillier Proposal Title: CONSTRAINTS ON MASSIVE STAR EVOLUTION FROM CARBON AND OXYGEN ABUNDANCES IN LMC WC STARS ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Pi John D Hillier UNIVERSITAT MUENCHEN GERMANY X Wolf-Rainer Hamann UNIVERSITAT KIEL GERMANY X Ulf Wessolowski UNIVERSITAT KIEL GERMANY X Keith Butler UNIVERSITAT MUENCHEN GERMANY X Rolf P Kudritzki UNIVERSITAT MUENCHEN GERMANY X Daniel J Lennon UNIVERSITAT MUENCHEN GERMANY X Stephen A Voels UNIVERSITAT MUENCHEN GERMANY X ------------------------------------------------------------------------------------ 3. Description of proposed observations. Using FOS we will observe 4 WC4 stars in the LMC. Three sets of spectra, covering the wavelength ranges 1150-1606A (grating G130H), 1573-2330A (G190H), and 2222-3301A (G270H), will be obtained for each star. For HD32402, we will aim for a continuum S to N ratio in excess of 70:1, while for the other 3 stars we will aim for a S/N ratio of 40:1. The blue digicon will be used for all 3 regions. Although the red digicon could be used for region 2 (G190H), we feel that its rapid response variation near 1600A would adversely affect our ability to reliably combine this spectrum with that extending from 1150 to 1606A. The region from 1500-1700A is particularly important as it contains the CIV 1550 resonance doublet, and HeII 1640 whose formation is somewhat different from other HeII emission lines. We chose the blue detector for G270H because of detector stability (ie. one detector used continuously for all exposures), because of the slight increase in wavelength range allowing greater overlap with ground based observations, and because of overall system efficiency. As recommended by the TAC, observations of a further 3WC stars, and one WO star will be requested in a subsequent cycle. The selected stars have been the subject of an extensive optical observational study by Torres et al (1986), and show no evidence for binarity. They represent a complete sample of the known single WC/WO stars in the LMC. The v magnitudes (corrected for emission lines) range from 14th to 16.5th magnitude (Vacca and Torres-Dodgen 1990). ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. NO GAP justification: The UV spectra of early type stars is known to vary with time. In order to obtain completely consistent UV spectra over our spectral range, we require that the spectra for our 3 wavelength ranges be obtained as close together as possible. In this case the NO GAP is provided by the ONBOARD ACQ requirements. The order does not matter hence we have not used the SEQ requirement. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. No special calibrations etc required. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. Revised target positions, obtained with GASP, are now supplied with the Phase 2 proposal. Target acquision strategies for HD32402, HD37680, and HD32257 provided by Tony Keyes. ------------------------------------------------------------------------------------ 11. Address Information Page 3 Name: JOHN D HILLIER Category: PI Institution: UNIVERSITY OF PITTSBURGH Address: DEPARTMENT OF PHYSICS AND ASTRONOMY 3941 O'HARA STRREET 100 ALLEN HALL City: PITTSBURGH, PA 15260 State: Zip Code: Country: USA Telephone: 412-624-9000 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5723 [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD32402 WS6 B,102; PLATE-ID=05ZW, 2000 V= +280 COMP 1 V=13.30 +/- 0.1, TYPE=WC4 BR10 HOST=LMC RA = 04H 57M 24.191S +/- 2 B-V=-0.19 +/- 0.05 TYPE=WC4 0.50", 3 E(B-V)=0.07 +/- 0.03 DEC = -68D 23' 57.23" +/- 4 F-CONT(5560)=9.0 +/- 0.5 E-15 0.50" 5 F-CONT(2225)=1.7 +/- 0.2 E-13 6 F-CONT(1690)=4.5 +/- 0.1 E-13 7 F-CONT(1285)=1.0 +/- 0.1 E-12 Comments: v=14.01 +/- 0.1 e(b-v)=0.06 ------------------------------------------------------------------------------------------------------------------------------------ 11 HD37026 WS31 B,102; PLATE-ID=05ZW, 2000 V= +280 1 V=13.60 +/- 0.1, TYPE=WC4 BR43 HOST=LMC RA = 05H 30M 12.216S +/- 2 B-V=-0.31 +/- 0.05 TYPE=WC4 0.50", 3 E(B-V)=0.06 +/- 0.02 DEC = -67D 26' 08.49" +/- 4 F-CONT(5560)=7.0 +/- 0.5 E-15 0.50" 5 F-CONT(2225)=6.9 +/- 0.5 E-14 6 F-CONT(1690)=1.8 +/- 0.2 E-13 7 F-CONT(1285)=4.6 +/- 0.5 E-13 Comments: v=14.46 +/- 0.1 e(b-v)=0.05 ------------------------------------------------------------------------------------------------------------------------------------ 21 HD37680 WS35 B,102; PLATE-ID=05ZW, 2000 V= +280 1 V=13.35 +/- 0.1, TYPE=WC4 BR50 HOST=LMC RA = 05H 34M 19.387S +/- 2 B-V=-0.20 +/- 0.05 TYPE=WC4 0.50", 3 E(B-V)=0.01 +/- 0.03 DEC = -69D 45' 10.08" +/- 4 F-CONT(5560)=8.0 +/- 0.5 E-15 0.50" 5 F-CONT(2225)=9.2 +/- 0.5 E-14 6 F-CONT(1690)=1.7 +/- 0.2 E-13 7 F-CONT(1285)=4.5 +/- 0.1 E-13 Comments: v=14.27 e(b-v)=0.01 ------------------------------------------------------------------------------------------------------------------------------------ 31 HD32257 WS4 B,102; PLATE-ID=05ZW, 2000 V= +280 1 V=14.27 +/- 0.1, TYPE=WC4 BR8 HOST=LMC RA = 04H 56M 02.952S +/- 2 B-V=-0.20 +/- 0.05 TYPE=WC4 0.50", 3 E(B-V)=0.07 +/- 0.03 DEC = -69D 27' 21.59" +/- 4 F-CONT(5560)=3.5 +/- 0.2 E-15 0.50" 5 F-CONT(2225)=3.2 +/- 0.2 E-14 6 F-CONT(1690)=7.8 +/- 0.2 E-14 7 F-CONT(1285)=2.2 +/- 0.1 E-13 Comments: v=15.12 +/- 0.1 e(b-v)=0.06 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5723 [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 HD32402 FOS/BL ACQ/ 4.3 G400H SEARCH-SIZE-X=1 1 2S 4 1 CYCLE 4 / 11-117 PEAK SEARCH-SIZE-Y=3 ONBOARD ACQ FOR 12 SCAN-STEP- Y=1.204 ------------------------------------------------------------------------------------------------------------------------------------ 12 HD32402 FOS/BL ACQ/ 1.0 G400H SEARCH-SIZE-X=6 1 2S 4 1 ONBOARD ACQ FOR 13 PEAK SEARCH-SIZE-Y=2 SCAN-STEP- X=.602 SCAN-STEP- Y=.602 ------------------------------------------------------------------------------------------------------------------------------------ 13 HD32402 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 4 1 ONBOARD ACQ FOR 14 PEAK SEARCH-SIZE-Y=5 SCAN-STEP- X=.172 SCAN-STEP- Y=.172 ------------------------------------------------------------------------------------------------------------------------------------ 14 HD32402 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 4 1 ONBOARD ACQ FOR 15 PEAK SEARCH-SIZE-Y=5 -17 SCAN-STEP- X=.052 SCAN-STEP- Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ 15 HD32402 FOS/BL ACCUM 0.3 G130H 1 1050S 70 5 1 ------------------------------------------------------------------------------------------------------------------------------------ 16 HD32402 FOS/BL ACCUM 0.3 G190H 1 600S 70 6 1 ------------------------------------------------------------------------------------------------------------------------------------ 17 HD32402 FOS/BL ACCUM 0.3 G270H 1 400S 70 7 1 ------------------------------------------------------------------------------------------------------------------------------------ 21 HD37026 FOS/BL ACQ/ 4.3 G400H SEARCH-SIZE-X=1 1 2S 2 ONBOARD ACQ FOR 22 PEAK SEARCH-SIZE-Y=3 SCAN-STEP- Y=1.204 ------------------------------------------------------------------------------------------------------------------------------------ 22 HD37026 FOS/BL ACQ/ 1.0 G400H SEARCH-SIZE-X=6 1 2S 2 ONBOARD ACQ FOR 25 PEAK SEARCH-SIZE-Y=2 -27 SCAN-STEP- X=.602 SCAN-STEP- Y=.602 ------------------------------------------------------------------------------------------------------------------------------------ 23 HD37026 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 2 ONBOARD ACQ FOR 24 PEAK SEARCH-SIZE-Y=5 SCAN-STEP- X=.172 SCAN-STEP- Y=.172 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5723 [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 24 HD37026 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 2 ONBOARD ACQ FOR 25 PEAK SEARCH-SIZE-Y=5 -27 SCAN-STEP- X=.052 SCAN-STEP- Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ 25 HD37026 FOS/BL ACCUM 0.3 G130H 1 740S 40 5 2 ------------------------------------------------------------------------------------------------------------------------------------ 26 HD37026 FOS/BL ACCUM 0.3 G190H 1 480S 40 6 2 ------------------------------------------------------------------------------------------------------------------------------------ 27 HD37026 FOS/BL ACCUM 0.3 G270H 1 320S 40 7 2 ------------------------------------------------------------------------------------------------------------------------------------ 31 HD37680 FOS/BL ACQ/ 4.3 G400H SEARCH-SIZE-X=1 1 2S 2 ONBOARD ACQ FOR 32 PEAK SEARCH-SIZE-Y=3 SCAN-STEP- Y=1.204 ------------------------------------------------------------------------------------------------------------------------------------ 32 HD37680 FOS/BL ACQ/ 1.0 G400H SEARCH-SIZE-X=6 1 2S 4 2 ONBOARD ACQ FOR 33 PEAK SEARCH-SIZE-Y=2 SCAN-STEP- X=.602 SCAN-STEP- Y=.602 ------------------------------------------------------------------------------------------------------------------------------------ 33 HD37680 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 4 2 ONBOARD ACQ FOR 34 PEAK SEARCH-SIZE-Y=5 SCAN-STEP- X=.172 SCAN-STEP- Y=.172 ------------------------------------------------------------------------------------------------------------------------------------ 34 HD37680 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 4 2 ONBOARD ACQ FOR 35 PEAK SEARCH-SIZE-Y=5 -37 SCAN-STEP- X=.052 SCAN-STEP- Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ 35 HD37680 FOS/BL ACCUM 0.3 G130H 1 750S 40 5 2 ------------------------------------------------------------------------------------------------------------------------------------ 36 HD37680 FOS/BL ACCUM 0.3 G190H 1 520S 40 6 2 ------------------------------------------------------------------------------------------------------------------------------------ 37 HD37680 FOS/BL ACCUM 0.3 G270H 1 230S 40 7 2 ------------------------------------------------------------------------------------------------------------------------------------ 41 HD32257 FOS/BL ACQ/ 4.3 MIRROR FAINT=660.0 1 1S 4 2 ONBOARD ACQ FOR 42 BINARY BRIGHT=33000.0 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5723 [ 7] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 42 HD32257 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 5S 4 2 ONBOARD ACQ FOR 43 PEAK SEARCH-SIZE-Y=5 SCAN-STEP- X=.172 SCAN-STEP- Y=.172 ------------------------------------------------------------------------------------------------------------------------------------ 43 HD32257 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 5S 4 2 ONBOARD ACQ FOR 44 PEAK SEARCH-SIZE-Y=5 -46 SCAN-STEP- X=.052 SCAN-STEP- Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ 44 HD32257 FOS/BL ACCUM 0.3 G130H 1 1600S 40 5 2 ------------------------------------------------------------------------------------------------------------------------------------ 45 HD32257 FOS/BL ACCUM 0.3 G190H 1 1100S 40 6 2 ------------------------------------------------------------------------------------------------------------------------------------ 46 HD32257 FOS/BL ACCUM 0.3 G270H 1 660S 40 7 2 ------------------------------------------------------------------------------------------------------------------------------------ 111 HD32402 FOS/BL ACQ/ 4.3 G400H SEARCH-SIZE-X=1 1 2S 4 1 ONBOARD ACQ FOR PEAK SEARCH-SIZE-Y=3 112 SCAN-STEP- Y=1.204 ------------------------------------------------------------------------------------------------------------------------------------ 112 HD32402 FOS/BL ACQ/ 1.0 G400H SEARCH-SIZE-X=6 1 2S 4 1 ONBOARD ACQ FOR PEAK SEARCH-SIZE-Y=2 113 SCAN-STEP- X=.602 SCAN-STEP- Y=.602 ------------------------------------------------------------------------------------------------------------------------------------ 113 HD32402 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 4 1 ONBOARD ACQ FOR PEAK SEARCH-SIZE-Y=5 114 SCAN-STEP- X=.172 SCAN-STEP- Y=.172 ------------------------------------------------------------------------------------------------------------------------------------ 114 HD32402 FOS/BL ACQ/ 0.3 G400H SEARCH-SIZE-X=5 1 2S 4 1 ONBOARD ACQ FOR PEAK SEARCH-SIZE-Y=5 115-117 SCAN-STEP- X=.052 SCAN-STEP- Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ 115 HD32402 FOS/BL ACCUM 0.3 G130H 1 300S 70 5 1 ------------------------------------------------------------------------------------------------------------------------------------ 116 HD32402 FOS/BL ACCUM 0.3 G190H 1 600S 70 6 1 ------------------------------------------------------------------------------------------------------------------------------------ 117 HD32402 FOS/BL ACCUM 0.3 G270H 1 400S 70 7 1 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5723 [ 8] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ACQ/BINARY ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE-X=1 SEARCH-SIZE-Y=3 SCAN-STEP-Y=1.204 SEARCH-SIZE-X=6 SEARCH-SIZE-Y=2 SCAN-STEP-X=.602 SCAN-STEP-Y=.602 SEARCH-SIZE-X=5 SEARCH-SIZE-Y=5 SCAN-STEP-X=.172 SCAN-STEP-Y=.172 SCAN-STEP-X=.052 SCAN-STEP-Y=.052 FAINT=660.0 BRIGHT=33000.0 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO/CAR ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 13.28 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category HOT STARS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category MASSIVE STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 4 / 11-117; ONBOARD ACQ FOR 12; ONBOARD ACQ FOR 13; ONBOARD ACQ FOR 14; ONBOARD ACQ FOR 15-17 ONBOARD ACQ FOR 22; ONBOARD ACQ FOR 25-27; ONBOARD ACQ FOR 24 ONBOARD ACQ FOR 32; ONBOARD ACQ FOR 33; ONBOARD ACQ FOR 34; ONBOARD ACQ FOR 35-37 ONBOARD ACQ FOR 42; ONBOARD ACQ FOR 43; ONBOARD ACQ FOR 44-46; ONBOARD ACQ FOR 112; ONBOARD ACQ FOR 113; ONBOARD ACQ FOR 114; ONBOARD ACQ FOR 115-117 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G400H G130H G190H G270H MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD32402 WS6 BR10 HD37026 WS31 BR43 HD37680 WS35 BR50 HD32257 WS4 BR8 ------------------------------------------------------------------------------------------------------------------------------------