Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5153 Report Date: 18-Jul-95:17:01 Version: ********** Check-in Date: ********** 1.Proposal Title: UV-BRIGHT STARS IN LEO I ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID GALAXIES & CLUSTERS GTO/FOC 2 Long Term yrs 3105 Sub Category STELLAR POPULATIONS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr. Jean-michel Deharveng LABORATOIRE D'ASTRONOMIE SPA FRANCE (33) 91055917 DR. ------------------------------------------------------------------------------------ 7. Abstract FOC ultraviolet images have resolved PAGB (Post-Asymptotic-Giant- Branch) stars in the inner bulge of the galaxy M31. These stars, however, contribute to less than 20 % of the total observed UV flux. The bulk of the UV emission should be explained by stars which, in metal-rich population, are predicted to move from the giant branch to the left of the HR diagram while skipping the AGB (Asymptotic-Giant-Branch) either partially or totally. The dwarf spheroidal galaxy Leo I provides an opportunity to resolve these categories of stars at intrinsically fainter level than possible in M31, down to the AGB-manque or HB phases of evolution. Observations will be performed with the FOC and the WFPC2 in parallel mode. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 3.50 par: 3.50 10. Num targs pri: 1 par: 1 ------------------------------------------------------------------------------------ 11. Instruments requested: FOC WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5153 PI: Dr. Jean-michel Deharveng Proposal Title: UV-BRIGHT STARS IN LEO I ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Dr. Jean-Michel Deharveng LABORATOIRE D'ASTRONOMIE FRANCE X SPATIALE, CNRS, MARSEILLE Prof. Ivan King ASTRONOMY DEPT., UNIVERSITY OF USA CALIFORNIA, BERKELEY ------------------------------------------------------------------------------------ 3. Description of proposed observations. Observations with the FOC F175W and F320W filters will allow to detect the UV- bright stars and to give their temperature and luminosity distribution. The angular extent of the galaxy allows parallel observations with the WFPC2 and comparable UV filters (F170W and F300W). ------------------------------------------------------------------------------------ 11. Address Information Name: JEAN-MICHEL DEHARVENG Category: PI Institution: LABORATOIRE D'ASTRONOMIE SPATIALE Address: TRAVERSE DU SIPHON, LES TROIS LUCS, BP 8 City: MARSEILLE CEDEX 12 State: Zip Code: 13376 Country: FRANCE Telephone: (33) 91055917 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5153 [ 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 LEOI E,308 RA = 10H 8M 26.7S +/- 1", 2000 V = 168 1 SURF(V) = 22.3 +/- 0.2 DEC = 12D 18' 29" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ TARGET LIST c)Generic Targets ID = 5153 [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 7 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria |Acqui|FLX| Flux data No | Name | Description | |Prblm|REF| | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 2 LEOI-GEN E,308 RA=10H 08M 26.7S, 1 SURF(V) = 22.3 +/- 0.2 DEC=12D 18' 29", R=10' ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5153 [ 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 LEOI FOC/96 IMAGE 512X102 F175W PIXEL=50X25 1 8400S 10 1 1 CYCLE 4 4 ------------------------------------------------------------------------------------------------------------------------------------ 2 LEOI FOC/96 IMAGE 512X102 F342W PIXEL=50X25 1 4200S 10 1 1 CYCLE 4 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 LEOI-GEN WFPC2 IMAGE WFALL F170W 1 8400S 10 1 1 PAR CYCLE 4 Comments: PARALLEL WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 LEOI-GEN WFPC2 IMAGE WFALL F300W 1 4200S 10 1 1 PAR CYCLE 4 Comments: PARALLEL WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5153 [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOC/96 WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters PIXEL ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/FOC ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 3.50 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category GALAXIES & CLUSTERS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 4 PAR; CYCLE 4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F175W F342W F170W F300W ------------------------------------------------------------------------------------------------------------------------------------ Target Names LEOI LEOI-GEN ------------------------------------------------------------------------------------------------------------------------------------