Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5516 Report Date: 18-Jul-95:17:34 Version: ********** Check-in Date: ********** 1.Proposal Title: A WFPC2 SNAPSHOT OF R136A ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR POPULATIONS SMC/ERO Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Sara R. Heap NASA, GODDARD SPACE FLIGHT C USA 301-286-5359 ------------------------------------------------------------------------------------ 7. Abstract R136a has historical importance in that Hubble images of of the stellar cluster, taken in July 1990 by the GHRS team, were the first scientifically interesting pictures taken by Hubble. The 40S picture showed without a doubt the superiority of Hubble over groundbased telescopes. A few days later, there was a press conference based on this picture of R136a, and the first ERO program was started in ernest. We now propose to repeat the imagery of R136a with WFPCs. The July 1990 picture was a 40S image taken with PC6 at F368M. This time, we will take a series of 3 pictures (5S, 10S, and 20S) pictures with PC1 at F336W. We will compare the new with: (1) the original July 1990 picture; (2) "deep" PC exposures that were the basis of study by Campbell et al. (1992), and Malumuth & Heap (1993). (3) the predicted field, as shown by Heap in an April press release and by Heap & Malumuth (1992). These pictures are also essential as "early acquisition" pictures for the GHRS ERO program on R136a. ------------------------------------------------------------------------------------ 8. Scientific Key Words: HOT STARS, MASSIVE STARS, CLUSTERS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 0.40 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5516 PI: Sara R. Heap Proposal Title: A WFPC2 SNAPSHOT OF R136A ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Sara R. Heap NASA, GODDARD SPACE FLIGHT USA CENTER ------------------------------------------------------------------------------------ 3. Description of proposed observations. This program will take three short exposures (5S, 10S, 20S) of R136a with PC1 at F336W. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. This program is in some sense an early acquisition for the GHRS ERO program on R136a. The PC1 pictures should be taken BEFORE the GHRS spectra. (This should not be hard to do, since the GHRS ERO program uses Side 1, which must first be recommissioned.) ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. NONE ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. The data need to be processed as well as possible, with whatever bias, flat, and dark frames are available at the time. We will work with the ST ScI and WFPC2 team to reduce the images. After reduction, we will make a comparison with (1) the original 40S F368M image, and the (2) the original ERO F336W images of R136a. We will also make a comparison to simulations of the field as seen by PC1, based on photometry of WFPC images of R136a. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. ------------------------------------------------------------------------------------ 9. Description of previous HST work. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). GSFC will provide the financial resources and computer resources for the data analysis. ------------------------------------------------------------------------------------ 11. Address Information Name: SARA R HEAP Category: PI Institution: GODDARD SPACE FLIGH CENTER Address: City: GREENBELT State: MD Zip Code: Country: USA Telephone: 301-286-5359 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5516 [ 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 R136 D,203 RA = 05H 38M 42.50S +/- J2000 1 U=12.09 0.15S, 1 B-V=-.24 DEC=-69D 06' 02.8" +/- 0.5" Comments: #1 IS THE U MAGNITUDE OF R136A1, THE BRIGHTEST STAR IN R136 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5516 [ 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 R136 WFPC2 IMAGE PC1 F336W 1 5S 40 1 1 CYCLE 4 Comments: EXPECT 1700 COUNTS IN BRIGHTEST PIXEL OF BRIGHTEST STAR, R136A1 U=12.09 ------------------------------------------------------------------------------------------------------------------------------------ 2 R136 WFPC2 IMAGE PC1 F336W 1 10S 58 1 1 CYCLE 4 Comments: EXPECT MAXIMUM IF 3400 COUNTS/ PIX IN BRIGHTEST STAR,U=12.09 ------------------------------------------------------------------------------------------------------------------------------------ 3 R136 WFPC2 IMAGE PC1 F336W 1 20S 1 1 CYCLE 4 Comments: BRIGHTEST STARS SHOULD SATURATE. A U=13.60 STAR SHOULD HAVE 1700 COUNTS MAXIMUM. ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5516 [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for SMC/ERO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 0.40 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 4; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W ------------------------------------------------------------------------------------------------------------------------------------ Target Names R136 ------------------------------------------------------------------------------------------------------------------------------------