Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 4122c Report Date: 09-May-96:19:13 Version: ********** Check-in Date: ********** 1.Proposal Title: THE STELLAR CONTENT OF WOLF-RAYET GALAXIES(FOS SPECTRA) ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR POPULATIONS GO 3810 Sub Category YOUNG FIELD STARS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr. Peter S. Conti JILA USA (303) 492-8497 ASTRONOMER ------------------------------------------------------------------------------------ 7. Abstract We propose to observe a comprehensive sample of Wolf-Rayet (W-R) galaxies --- starburst galaxies in which broad 4686 He II emission of stellar origin has been detected. These galaxies generally contain far more W-R stars than the Milky Way, M31, and other normal galaxies. The ultraviolet FOC images and FOS spectra will be combined with optical and infrared data as part of a large effort to perform a broad, systematic analysis of the properties of W-R galaxies. The UV data obtained with HST will provide crucial constraints on the hot star (O and W-R) populations, and will lead to a better understanding of the physical conditions, initial mass functions, and starburst parameters of these galaxies. The overall continuum will be analyzed within the framework of evolutionary and spectral synthesis models that we are developing. Quantitative spectroscopy of UV resonance lines will allow us to study the hot star populations in detail, and to directly measure the number of OB stars within these galaxies. Our main goal is to determine which physical properties of W-R galaxies (e.g., IMF slope, chemical composition, age, strength and duration of the starburst) have led to the production of large numbers of W-R stars. The results of this study will have important implications for our understanding of W-R galaxies, and also of starburst and emission-line galaxies in general. ------------------------------------------------------------------------------------ 8. Scientific Key Words: LBV'S, WOLF-RAYET STARS, STARBURSTS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 2.22 par: 0 10. Num targs pri: 18 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 4122c PI: Dr. Peter S. Conti Proposal Title: THE STELLAR CONTENT OF WOLF-RAYET GALAXIES(FOS SPECTRA) ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Pi Peter S. Conti UNIVERSITY OF COLORADO USA Alexei V. Filippenko UNIVERSITY OF CALIFORNIA, USA BERKELEY Claus Leitherer SPACE TELESCOPE SCIENCE USA X INSTITUTE Carmelle Robert SPACE TELESCOPE SCIENCE USA INSTITUTE Wallace L. Sargent CALIFORNIA INSTITUTE OF USA TECHNOLOGY William D. Vacca UNIVERSITY OF CALIFORNIA, USA BERKELEY ------------------------------------------------------------------------------------ 3. Description of proposed observations. We would like to obtain FOS spectra of the brightest knots of some W-R galaxies. The objects were selected on the basis of the FOC data from another proposal; There may be more than one knot per galaxy. The scientific goal can be best achieved with the FOS and gratings G130H and G190H. We intend to use the blue- side detector for both gratings. A peak-up technique is used for the TA. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. It is the combination of the superior resolution (IUE: 6A; FOS: 3A for a knot of 2-3") and vastly better S/N (IUE: typically 10; FOS: 35 for our proposed observations) of HST data which provide a dramatic improvement. STRONG lines (like C IV) can be modeled quantitatively with HST, and WEAKER lines (like N IV 1718, which is an important signature of hot EVOLVED stars) can only be detected with HST, in contrast to IUE. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. No special calibrations are requested. According to the FOC instrument scientist, PSF's will be provided by STScI. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. The general management of the observations (including the ground observations) and the data reduction and interpretation will be coordinated by Peter Conti. FOS deconvolution will be carried out by Claus Leitherer. P. Conti is also in charge of the pre-analysis of the HST observations (line identification, interstellar extinction...). Other observations from the ground are to be acquired, reduced and analysed by Alex Filippenko, Wal Sargent and Bill Vacca. The population synthesis models will be done at STScI by Carmelle Robert and Claus Leitherer. All co-Is will be intimately involved with data analysis and interpretation. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. The HST observations are supported by ground-based observations. There is no need for simultaneous observations. ------------------------------------------------------------------------------------ 11. Address Information Page 3 Name: PETER S CONTI Category: PI Institution: JILA/UNIV. OF COLORADO Address: CAMPUS BOX 440 City: BOULDER State: CO Zip Code: 80309 Country: USA Telephone: (303) 492-8497 Telex (or e-mail): 755842 JILA ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 4122c [ 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| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3125A- E,318,928 RA=10H 06M 33.3S +/- 0.1S, 2000 EXT OFFSET DEC=-29D 56' 09.4" +/-1.0" ------------------------------------------------------------------------------------------------------------------------------------ 14 NGC4214 E,318,928 RA=12H 15M 39.3S +/- 0.1S, 2000 EXT DEC=+36D 19' 36.3" +/-1.0" ------------------------------------------------------------------------------------------------------------------------------------ 100 NGC3125B E,318,928 XI-OFF = +7.9" +/- 0.2", 2000 EXT ETA-OFF = -4.3" +/- 0.2", FROM 10 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4122c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 100 NGC3125A- FOS/BL ACQ/ 4.3 MIRROR TYPE=UP 1 0.47S 1 CYCLE 2 OFFSET PEAK SEARCH-SIZE-X=2 ONBOARD ACQ FOR SEARCH-SIZE-Y=6 101 SCAN-STEP-X=4.3 SEQ 100-105 NO GAP SCAN-STEP-Y=1.4 ------------------------------------------------------------------------------------------------------------------------------------ 101 NGC3125A- FOS/BL ACQ/ 1.0 MIRROR TYPE=UP 1 1.0S 1 CYCLE 2 OFFSET PEAK SEARCH-SIZE-X=6 ONBOARD ACQ FOR SEARCH-SIZE-Y=2 102 SCAN-STEP-X=0.7 SCAN-STEP-Y=0.7 ------------------------------------------------------------------------------------------------------------------------------------ 102 NGC3125A- FOS/BL ACQ/ 0.5 MIRROR TYPE=UP 1 1.5S 1 CYCLE 2 OFFSET PEAK SEARCH-SIZE-X=3 ONBOARD ACQ FOR SEARCH-SIZE-Y=3 103-105 SCAN-STEP- X=0.35 SCAN-STEP- Y=0.35 ------------------------------------------------------------------------------------------------------------------------------------ 103 NGC3125A- FOS/BL ACCUM 1.0 G130H 1 9300S 1 CYCLE 2 OFFSET ------------------------------------------------------------------------------------------------------------------------------------ 104 NGC3125A- FOS/BL ACCUM 1.0 G190H 1 4000S 1 CYCLE 2 OFFSET ------------------------------------------------------------------------------------------------------------------------------------ 105 NGC3125A- FOS/BL ACQ 4.3 MIRROR 1 64S 1 CYCLE 2 OFFSET Comments: IMAGE TO LOCATE THE APERTURE; ------------------------------------------------------------------------------------------------------------------------------------ 200 NGC3125B FOS/BL ACQ/ 4.3 MIRROR TYPE=UP 1 0.47S 1 CYCLE 2 PEAK SEARCH-SIZE-X=2 ONBOARD ACQ FOR SEARCH-SIZE-Y=6 201 SCAN-STEP-X=4.3 SEQ 200-205 NO GAP SCAN-STEP-Y=1.4 ------------------------------------------------------------------------------------------------------------------------------------ 201 NGC3125B FOS/BL ACQ/ 1.0 MIRROR TYPE=UP 1 1.0S 1 CYCLE 2 PEAK SEARCH-SIZE-X=6 ONBOARD ACQ FOR SEARCH-SIZE-Y=2 202 SCAN-STEP-X=0.7 SCAN-STEP-Y=0.7 ------------------------------------------------------------------------------------------------------------------------------------ 202 NGC3125B FOS/BL ACQ/ 0.5 MIRROR TYPE=UP 1 1.5S 1 CYCLE 2 PEAK SEARCH-SIZE-X=3 ONBOARD ACQ FOR SEARCH-SIZE-Y=3 203-205 SCAN-STEP- X=0.35 SCAN-STEP- Y=0.35 ------------------------------------------------------------------------------------------------------------------------------------ 203 NGC3125B FOS/BL ACCUM 1.0 G190H 1 4000S 1 CYCLE 2 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4122c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 204 NGC3125B FOS/BL ACCUM 1.0 G130H 1 9300S 1 CYCLE 2 ------------------------------------------------------------------------------------------------------------------------------------ 205 NGC3125B FOS/BL ACQ 4.3 MIRROR 1 64S 1 CYCLE 2 Comments: IMAGE TO LOCATE THE APERTURE ------------------------------------------------------------------------------------------------------------------------------------ 300 NGC4214 FOS/BL ACQ/ 4.3 MIRROR TYPE=UP 1 0.12S 1 CYCLE 2 PEAK SEARCH-SIZE-X=2 ONBOARD ACQ FOR SEARCH-SIZE-Y=6 301 SCAN-STEP-X=4.3 SCAN-STEP-Y=1.4 ------------------------------------------------------------------------------------------------------------------------------------ 301 NGC4214 FOS/BL ACQ/ 1.0 MIRROR TYPE=UP 1 0.25S 1 CYCLE 2 PEAK SEARCH-SIZE-X=6 ONBOARD ACQ FOR SEARCH-SIZE-Y=2 302 SCAN-STEP-X=0.7 SCAN-STEP-Y=0.7 ------------------------------------------------------------------------------------------------------------------------------------ 302 NGC4214 FOS/BL ACQ/ 0.5 MIRROR TYPE=UP 1 0.4S 1 CYCLE 2 PEAK SEARCH-SIZE-X=3 ONBOARD ACQ FOR SEARCH-SIZE-Y=3 303-305 SCAN-STEP- X=0.35 SCAN-STEP- Y=0.35 ------------------------------------------------------------------------------------------------------------------------------------ 303 NGC4214 FOS/BL ACCUM 1.0 G130H 1 1900S 1 CYCLE 2 SEQ 300-305 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 304 NGC4214 FOS/BL ACCUM 1.0 G190H 1 1000S 1 CYCLE 2 ------------------------------------------------------------------------------------------------------------------------------------ 305 NGC4214 FOS/BL ACQ 4.3 MIRROR 1 17S 1 CYCLE 2 Comments: IMAGE TO LOCATE THE APERTURE; ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 4122c [ 7] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters TYPE=UP SEARCH-SIZE-X=2 SEARCH-SIZE-Y=6 SCAN-STEP-X=4.3 SCAN-STEP-Y=1.4 SEARCH-SIZE-X=6 SEARCH-SIZE-Y=2 SCAN-STEP-X=0.7 SCAN-STEP-Y=0.7 SEARCH-SIZE-X=3 SEARCH-SIZE-Y=3 SCAN-STEP-X=0.35 SCAN-STEP-Y=0.35 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 2.22 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category YOUNG FIELD STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 2; ONBOARD ACQ FOR 101; SEQ 100-105 NO GAP ONBOARD ACQ FOR 102 ONBOARD ACQ FOR 103-105; ONBOARD ACQ FOR 201; SEQ 200-205 NO GAP ONBOARD ACQ FOR 202 ONBOARD ACQ FOR 203-205; ONBOARD ACQ FOR 301; ONBOARD ACQ FOR 302 ONBOARD ACQ FOR 303-305; SEQ 300-305 NO GAP; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G130H G190H ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC3125A-OFFSET NGC4214 NGC3125B ------------------------------------------------------------------------------------------------------------------------------------