Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1239c Report Date: 09-May-96:16:22 Version: ********** Check-in Date: ********** 1.Proposal Title: BULGE STELLAR POPULATIONS IN SO GALAXIES ------------------------------------------------------------------------------------ 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 LABORATOIRE ASTRONOMIE SPATI FRANCE 91 05 59 17 ------------------------------------------------------------------------------------ 7. Abstract It is proposed to study the origin of the UV flux in elliptical-type population and to determine the respective contribution from young stars and from hot stars commonly occurring in an old stellar population. Two SO galaxies NGC 5102 and MGC 3115, at reasonable distance and with very different gas contents, have been selected. Observations through several filters (especially a far UV filter) will allow to resolve and study the massive stars, if they exist. The UV surface brightness of the unresolved background will be measured and will set constraints on the characteristics of hot evolved stars. A spectrum of the nucleus of NGC 5102 will allow to search for any evidence of nuclear activity which may contribute to the UV flux. ------------------------------------------------------------------------------------ 8. Scientific Key Words: EARLY-TYPE GALAXIES, STAR FORMATION ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 3.00 par: 0 10. Num targs pri: 3 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1239c PI: J. M. Deharveng Proposal Title: BULGE STELLAR POPULATIONS IN SO GALAXIES ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The high spatial resolution of the FOC will provide the possibility to resolve the young and massive stars, if they exist, in two examples of relatively nearby elliptical-type poulation. This capability is further improved by the good response of the FOC in the ultra-violet. At these wavelengths, the contrast of young and hot stars would be enhanced against the contribution of the main- sequence and giant-branch components of the old stellar population. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Data analysis capabilities (VAX) research assistance ------------------------------------------------------------------------------------ 13. It is proposed to study th origin of the UV flux in elliptical-type population and to determine the respective contribution from young stars and from hot stars commonly occurring in an old stellar population. Two SO galaxies NGC5102 and NGC 3115, at reasonable distance and with very different gas contents, have been selected. Observations through several filters (especially a far UV filter) will allow to resolve and study the massive stars, if they exist. The UV surface brightness of the unresolved background will be measured and will set constraints on the characteristics of hot evolved stars. A spectrum of the nucleus of NGC5102 will allow to search for any evidence of neclear activity which may contribute to the UV flux. ------------------------------------------------------------------------------------ 11. Address Information Name: J. M. DEHARVENG Category: PI Institution: LABORATOIRE ASTRONOMIE SPATIALE Address: C.N.R.S. TRAVERSE DU SIPHON LE TROIS LUCS City: MARSEILLE State: Zip Code: Country: FRANCE Telephone: 91 05 59 17 Telex (or e-mail): 420584F ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1239c [ 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 NGC5102 GALAXY; TYPE=SO; RA=13H 21M 57.5S +/- 4", 2000 V=454 EXT 1 SURF(V)=17.5 NUCLEUS; BULGE DEC=-36D 37' 49" +/- 4" 2 V=25.2, TYPE=B1V 3 F-CONT(1500)=0.5 +/- 0.15E-14 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC3115 ^ RA=10H 05M 14.2S +/- 4", ^ V=698 ^ 1 V=25.7, TYPE=B1V DEC=-7D 43' 5" +/- 4" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1239c [ 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 NGC5102 FOC/48 IMAGE 512X512 F150W 1 1000S 6 2 1 CYCLE 2 / 1-2 GUID TOL 0.020" / 1-6 ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ ^ ^ ^ F342W ^ 600S ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ ^ ^ ^ F275W ^ 400S ^ 2 CYCLE 2 / 3-4 COND IF TAC OK / 3 -4 ------------------------------------------------------------------------------------------------------------------------------------ 3.5 ^ FOC/96 ^ ^ F430W ^ 500S ^ 2 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC5102 FOC/48 SPEC 256X102 PRISM3 ^ 1400S 8 1 ^ 4-SLIT 3 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC3115 ^ IMAGE 512X512 F150W ^ 1200S 6 1 2 CYCLE 2 / 5-6 ------------------------------------------------------------------------------------------------------------------------------------ 6 ^ ^ ^ ^ F342W ^ 600S ^ 2 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1239c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOC/48 ^ FOC/96 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ^ SPEC ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/FOC ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 3.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category NEARBY GALAXIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 2 / 1-2; GUID TOL 0.020" / 1-6; CYCLE 2 / 3-4; COND IF TAC OK / 3-4; CYCLE 2 / 5-6; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F150W F342W F275W F430W PRISM3 ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC5102 NGC3115 ------------------------------------------------------------------------------------------------------------------------------------