Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1257c Report Date: 09-May-96:16:23 Version: ********** Check-in Date: ********** 1.Proposal Title: MASSIVE STARS IN EXTRAGALACTIC HII REGIONS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR POPULATIONS GTO/FOC Sub Category NEARBY GALAXIES ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone J. M. Deharveng CNRS,LABORATOIRE ASTRONOMIE FRANCE 91 05 59 17 ------------------------------------------------------------------------------------ 7. Abstract It is proposed to take advantage of the high angular resolution and UV response of the Faint Object Camera to study the young massive stellar population in giant extragalactic HII regions. This will, in turn, enable to determine the upper Initial Mass Function in conditions different from those in the solar neighborhood. Three HII regions, NGC 604 and NGC 595 in the galaxy M33, NGC 5471 in the galaxy M 101 have been selected for observations at the f/96 mode. Three filters, including one in the far UV, are required for each target. ------------------------------------------------------------------------------------ 8. Scientific Key Words: MASSIVE STARS, HII REGIONS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 5.00 par: 0 10. Num targs pri: 4 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1257c PI: J. M. Deharveng Proposal Title: MASSIVE STARS IN EXTRAGALACTIC HII REGIONS ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ James Lequeux MARSEILLE OBSERVATORY FRANCE X M. Joubert CNRS, LABORATORY FOR SPACE FRANCE X ASTRONOMY J. M. Deharveng CNRS, LABORATORY FOR SPACE FRANCE X ASTRONOMY ------------------------------------------------------------------------------------ 3. Description of proposed observations. Observations at high angular resolution (F/96) through three filters (F165W, F342W and F437M) in order to build a color-magnitude diagram for the brightest stars and to have a first evaluation of dust extinction. The filter F437M is used to get a near B flux while avoiding H-beta. Four targets: NGC 604 (2 positions) NGC 595 NGC 5471 The respective exposure times are based on the detection and resolution of stars down to M_v = -2 (NGC 604 - position 1), M_v = -1 (NGC 604 - position 2 and NGC 595), M_v = -5 (NGC 5471). In one case, two exposures are duplicated with additional neutral density filters in order to calibrate the photometry of overexposed images. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The HST will enable to study the massive stars of giant extragalactic HII regions in which ground-based observations are definitively limited by the stellar crowding. The best angular resolution which is provided by the FOC, is needed and the UV spectral range improves the selection of hot massive stars. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. To be done on LAS VAX. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Data analysis capabilities Research assistance ------------------------------------------------------------------------------------ 13. It is proposed to take advantage of the high angular resolution and UV response of the Faint Object Camera to study the young massive stellar population in giant extragalactic HII regions. This will, in turn, enable to determine the upper Initial Mass Function in conditions different from those in the solar neighborhood. Three HII regions, NGC 604 and NGC 595 in the galaxy M33, NGC 5471 in the galaxy M 101 have been selected for observations at the f/98 mode. Three filters, including one in the far UV, are required for each target. ------------------------------------------------------------------------------------ 11. Address Information Name: J. M. DEHARVENG Category: PI Institution: LABORATOIRE D'ASTRONOMIE SPATIALE Address: TRAVERSE DU SIPHON LES TROIS LUCS 13012 City: MARSEILLE State: Zip Code: Country: FRANCE Telephone: 91 05 59 17 Telex (or e-mail): 420584 F ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1257c [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 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 NGC604-POS1 EXT-CLUSTER; HII REGION RA=1H 34M 32.75S +/- 1", 2000 V=-240 EXT 1 V=22.8, TYPE=B2.5V, A(V)=1 +/- 0.2 DEC=30D 47' 07" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC604-POS2 ^ RA=1H 34M 32.43S +/- 1", ^ ^ EXT 1 V=23.6, TYPE=B5V, A(V)=0.8 +/- 0.2 DEC=30D 46' 58.5" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC595 ^ RA=1H 33M 33.82S +/- 1", ^ V=-188 EXT 1 V=23.9, TYPE=B5V, A(V)=1 +/- 0.3 DEC=30D 41' 33" +/- 1", ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1257c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 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 NGC604-POS1 FOC/96 IMAGE 512X512 F165W 1 1000S 10 1 1 CYCLE 2 / 1-3.5 GUID TOL 0.020" / 1-11.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ ^ ^ ^ F342W ^ 600S ^ 2 DARK TIME / 2-3.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ ^ ^ ^ F430W ^ 800S ^ 2 ------------------------------------------------------------------------------------------------------------------------------------ 3.5 ^ ^ ^ ^ F600M ^ 200S ^ 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC604-POS2 ^ ^ ^ F165W ^ 1600S 10 2 CYCLE 2 / 6-8.5 COND IF TAC OK / 6 -8.5 ------------------------------------------------------------------------------------------------------------------------------------ 7 ^ ^ ^ ^ F342W ^ 600S ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 8 ^ ^ ^ ^ F430W ^ 800S ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 8.5 ^ ^ ^ ^ F600M 1 400S 10 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC595 ^ ^ ^ F165W ^ 600S ^ ^ CYCLE 2 ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC595 FOC/96 IMAGE 512X512 F342W 1 1000S 10 1 2 CYCLE 2 / 10-11.5 COND IF TAC OK / 10-11.5 ------------------------------------------------------------------------------------------------------------------------------------ 11 ^ ^ ^ ^ F430W ^ 1200S ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 11.5 ^ ^ ^ ^ F600M ^ 400S ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1257c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOC/96 ^ ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ^ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/FOC ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 5.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category NEARBY GALAXIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 2 / 1-3.5; GUID TOL 0.020" / 1-11.5; DARK TIME / 2-3.5; CYCLE 2 / 6-8.5; COND IF TAC OK / 6-8.5; CYCLE 2; CYCLE 2 / 10-11.5; COND IF TAC OK / 10-11.5; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F165W F342W F430W F600M ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC604-POS1 NGC604-POS2 NGC595 ------------------------------------------------------------------------------------------------------------------------------------