Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5702 Report Date: 18-Jul-95:17:52 Version: ********** Check-in Date: ********** 1.Proposal Title: EXTREME STELLAR WINDS AND POST-MAIN-SEQUENCE EVOLUTION IN THE UPPER HERTZSPRUNG- RUSSELL DIAGRAM ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS GO/CAR 4260 Sub Category MASSIVE STARS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr. Claus Leitherer STSCI USA (410) 338-4425 ASTRONOMER ------------------------------------------------------------------------------------ 7. Abstract We propose to obtain spectroscopy of 1 Ofpe/WNL star in the LMC with the FOS + gratings G130H,G190H. Ofpe/WNL stars are hot luminous objects with spectral characteristics intermediate between WR and Of stars. Their wind densities make them ideal test cases to study BOTH wind AND photospheric properties: the mass loss is significantly higher than in normal O stars so that different wind regions can be sampled by numerous lines, yet it is not so high as to completely veil the photosphere, as occurs in W-R stars. We will take advantage of this unique opportunity and perform a detailed non-LTE analysis using the most sophisticated model atmospheres in existence. A complete set of stellar parameters, including the mass- loss rate and velocity field, will be derived empirically. The results will be compared to the predictions of the theory of radiatively driven winds. We will assess the question if radiation pressure can IN PRINCIPLE drive mass loss in this part of the HRD, and we will investigate if the current hot star wind theory makes QUANTITATIVELY correct predictions for Ofpe/WNL and related O stars. A second goal of this proposal is to evaluate the evolutionary status of Ofpe/WNL stars. Based on the stellar parameters --- including abundances --- found in our analysis, we will test the suggestion that these objects are the evolutionary link between O and W-R stars. ------------------------------------------------------------------------------------ 8. Scientific Key Words: MASS LOSS, MASSIVE STARS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 0.01 par: 0 10. Num targs pri: 7 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5702 PI: Dr. Claus Leitherer Proposal Title: EXTREME STELLAR WINDS AND POST-MAIN-SEQUENCE EVOLUTION IN THE UPPER HERTZSPRUNG- RUSSELL DIAGRAM ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Dr. Claus Leitherer SPACE TELESCOPE SCIENCE USA X INSTITUTE Dr. Laurent Drissen SPACE TELESCOPE SCIENCE USA INSTITUTE Dr. Ivan Hubeny GODDARD SPACE FLIGHT CENTER USA Dr. Norbert Langer UNIVERSITAETSSTERNWARTE GERMANY X GOETTINGEN Dr. Anthony F. Moffat UNIVERSITE DE MONTREAL CANADA Dr. Antonella Nota SPACE TELESCOPE SCIENCE USA X INSTITUTE Dr. Carmelle Robert SPACE TELESCOPE SCIENCE USA INSTITUTE Dr. Nicole St.-Louis UNIVERSITE DE MONTREAL CANADA Dr. Werner Schmutz ETH ZUERICH SWITZERLAND X ------------------------------------------------------------------------------------ 3. Description of proposed observations. We plan to obtain spectra with the FOS and gratings G130H and G190H. This instrument configuration will provide complete wavelength coverage from 1150 A to 2300 A at a resolving power of about 1400. the 0.3" aperture will be used. We intend to use the blue-side detector for both gratings. The blue-side detector is about a factor of 2 slower than the red-side detector at 2000 A. However, the sensitivity of the red-side detector decreases dramatically below 1700 A, and becomes lower than the sensitivity of the blue-side detector below 1650 A for G190H. As a consequence, data obtained with the red-side detector between 1600A and 1700 A are difficult to calibrate (G. Hartig, FOS Instrument Scientist, priv. comm.) and will be unreliable. Since several important strategic lines are located in this spectral region, we prefer to use the blue-side detector also for grating G190H. The factor-of-2 increase in exposure time at 2000 A (relative to G190H + red-side detector) is acceptable, especially since exposure times longward of 1600 A are short anyway in comparison to exposure times below 1600 A. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. No special scheduling requirements. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. BE294 and -69D249C must be observed at a specific orientation. They have nearby companion stars which would otherwise fall within in the slit. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. Some supporting ground-based observations have already been obtained. ------------------------------------------------------------------------------------ 11. Address Information Page 3 Name: CLAUS LEITHERER Category: PI Institution: STSCI Address: 3700 SAN MARTIN DRIVE City: BALTIMORE State: MD Zip Code: 21218 Country: USA Telephone: (410) 338-4425 Telex (or e-mail): 684-9101-STSCI ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5702 [ 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 BE381 B,103,107,146,905 RA=05H 35M 54.45S +/- 0.05S, 2000 1 V=13.3 +/- 0.2, B-V=+0.0, E(B- DEC=-68D 59' 07.4" +/-0.3", V)=0.3 PLATE-ID=06B0 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5702 [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 BE381 FOS/BL ACQ/ 4.3 MIRROR 1 0.84S 1 1 ONBOARD ACQ FOR 2 BINARY SEQ 1-4 CYCLE 4 / 1-4 ------------------------------------------------------------------------------------------------------------------------------------ 2 BE381 FOS/BL ACQ/ 0.3 MIRROR TYPE=UP 1 2.5S 1 1 ONBOARD ACQ FOR PEAK SEARCH-SIZE-X=3 2.5 SEARCH-SIZE-Y=3 SCAN-STEP- X=.172 SCAN-STEP- Y=.172 ------------------------------------------------------------------------------------------------------------------------------------ 2.5 BE381 FOS/BL ACQ/ 0.3 MIRROR TYPE=UP 1 2.5S 1 1 ONBOARD ACQ FOR 3- PEAK SEARCH-SIZE-X=5 4 SEARCH-SIZE-Y=5 SCAN-STEP- X=.052 SCAN-STEP- Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ 3 BE381 FOS/BL ACCUM 4.3 G130H 1 9000S 75 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 BE381 FOS/BL ACCUM 4.3 G190H 1 6000S 75 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5702 [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/BINARY ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters TYPE=UP SEARCH-SIZE-X=3 SEARCH-SIZE-Y=3 SCAN-STEP-X=.172 SCAN-STEP-Y=.172 SEARCH-SIZE-X=5 SEARCH-SIZE-Y=5 SCAN-STEP-X=.052 SCAN-STEP-Y=.052 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO/CAR ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 0.01 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category MASSIVE STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2; SEQ 1-4; CYCLE 4 / 1-4 ONBOARD ACQ FOR 2.5; ONBOARD ACQ FOR 3-4; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G130H G190H ------------------------------------------------------------------------------------------------------------------------------------ Target Names BE381 ------------------------------------------------------------------------------------------------------------------------------------