Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1248c Report Date: 09-May-96:16:22 Version: ********** Check-in Date: ********** 1.Proposal Title: SEARCH FOR YOUNG STARS IN DWARF ELLIPTICALS ------------------------------------------------------------------------------------ 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 MARSEILLE OBSERVATORY FRANCE 91 05 59 17 ------------------------------------------------------------------------------------ 7. Abstract Search for young stars in 2 dwarf elliptical galaxies is proposed. Several of these galaxies in the local group and recently in the Virgo cluster are known to contain young stars. The origin of this ongoing star formation is still unknown. Only high resolution Space Telescope FOC observation will allow to study the properties of the star formation regions in galaxies outside the local group. Then we propose FOC f/48 observations of 2 dwarf elliptical galaxies. They have been selected on the basis of multicolor CCD photometry obtained at the Canada France Hawaii telescope. Three filters are needed for each exposure. A UV image help to detect the brightest hot stars and U and B filters allow to determine the dust extinction and the colors of the brightest stars. ------------------------------------------------------------------------------------ 8. Scientific Key Words: DWARF ELLIPTICAL, YOUNG STARS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 2.00 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1248c PI: J. M. Deharveng Proposal Title: SEARCH FOR YOUNG STARS IN DWARF ELLIPTICALS ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ J. M. Deharveng LABORATOIRE ASTRONOMIE SPATIALE FRANCE X L. Vigroux CEN, SERVICE ASTROPHYSIQUE FRANCE X ------------------------------------------------------------------------------------ 3. Description of proposed observations. For each of the objects (NGC4627, DW5 near NGC4321), exposures through three filters (far UV F150W, U and B) aim at resolving the brightest massive stars and determining a c-m diagram. The exposure times are calculated to detect stars down to Mv = -4 in NGC4627 and to Mv = -5 in DW5. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The high spatial resolution and the UV response of the FOC are unique capabilities to search and resolve young and massive stars in dwarf ellipticals at the distance of Virgo Cluster. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Data analysis capabilities (VAX). ------------------------------------------------------------------------------------ 13. Ultra-violet surface photometry and search for young stars in dwarf elliptical galaxies - Colour magnitude array of resolved stars. ------------------------------------------------------------------------------------ 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): 420584F ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1248c [ 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 IC783 GALAXY; DWARF RA=12H 19M 6.6S +/- 10", 1950 V=1600 EXT 1 V=26, TYPE=BOV ELLIPTICAL DEC=16D 01' 24" +/- 10" ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4321-DW5 ^ RA=12H 23M 21.28S +/- 1", 2000 V=1610 ^ 1 SURF(V)=21.5 DEC=15D 52' 5.2" +/- 1" 2 V=26, TYPE=08 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1248c [ 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 NGC4321-DW5 FOC/48 IMAGE 512X512 F150W 1 1300S 13 2 1 CYCLE 2 / 1-3 ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ ^ ^ ^ F342W ^ 400S ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ ^ ^ ^ F275W ^ 600S ^ 2 ------------------------------------------------------------------------------------------------------------------------------------ 4 IC783 ^ ^ ^ F150W ^ 1300S 10 1 ^ CYCLE 2 / 4-6 COND IF TAC OK / 4 -6 ------------------------------------------------------------------------------------------------------------------------------------ 5 ^ ^ ^ ^ F342W ^ 400S ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 6 ^ ^ ^ ^ F275W ^ 600S ^ 2 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1248c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOC/48 ^ ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ^ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/FOC ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 2.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category NEARBY GALAXIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 2 / 1-3; CYCLE 2 / 4-6; COND IF TAC OK / 4-6; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F150W F342W F275W ------------------------------------------------------------------------------------------------------------------------------------ Target Names IC783 NGC4321-DW5 ------------------------------------------------------------------------------------------------------------------------------------