6892( 5) - 08/12/96 15:20 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6892 Version: 5 Check-in Date: 12-Aug-1996 15:17:08 1.Proposal Title: GLOBULAR CLUSTER CORE STRUCTURE AND DYNAMICS (FOS 36) - Part 2 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle STELLAR POPULATIONS AUG/FOS 4 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: RALPH BOHLIN SPACE TELESCOPE SCIENCE INSTITUTE ------------------------------------------------------------------------------------ 6. Abstract Obtain data on the stellar populations in the central cores of globular clusters. Clusters with and without central unresolved cusps, and with and without central X- ray sources will be observed. Spectra will be obtained at the center of the UV brightness, and at a distance within about one core radius. We might expect these spectra to differ; massive objects formed in collisions may produce unexpected spectral features, as well as relatively intense UV radiation in the central core. WFPC2 imaging data for NGC 1851 to be shared with GO program 6095 (Djorgovski et al.) ------------------------------------------------------------------------------------ Observations Description ------------------------ Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- This program completes the observations begun in program 5696 by replacing the second visit of that program. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6892( 5) - 08/12/96 15:20 - [ 2] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1851- STAR,K III-I, RA=5H 14M 7.027S +/- 0.010S,DEC= J2000 V = 13.3+/-0.2 OFFSET -40D 2' 31.73" +/- 0.01",PLATE- B = 14.0+/-0.2 ID=00AN Comments: POSITION UPDATED FROM WFPC2 3 NGC1851-STAR UNIDENTIFIED,ULTRAVIOLE RA-OFF=-0.597S+/- 0.01S,DEC-OFF= J2000 B-V = 0.0+/-150.0e-2 T EMITTER,X-RAY -6.66"+/- 0.1",FROM 2 B = 20.5+/-0.5 EMITTER, Comments: POSITION AND FLUXES UPDATED FROM WFPC2 IMAGES 6892( 5) - 08/12/96 15:20 - [ 3] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC1851-OFF FOS/BL ACQ/PEA 4.3 G400H SCAN-STEP-Y=1.23,SEARCH-SIZE-Y=3, 1 2.5 S ONBOARD ACQ FOR 20 SET K SEARCH-SIZE-X=1 Comments: ACQUIRE THE OFFSET STAR. EXPOSURE TIME AND POSITION UPDATED BASED ON WFPC2. ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC1851-OFF FOS/BL ACQ/PEA 1.0-PAI G400H SCAN-STEP-Y=0.61,SCAN-STEP-X=0.61 1 2.5 S ONBOARD ACQ FOR 30 SET K R-A ,SEARCH-SIZE-Y=2,SEARCH-SIZE-X=6 ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC1851-OFF FOS/BL ACQ/PEA 0.5-PAI G400H SCAN-STEP-Y=0.29,SCAN-STEP-X=0.29 1 3 S ONBOARD ACQ FOR 60 SET K R-A ,SEARCH-SIZE-Y=3,SEARCH-SIZE-X=3 ------------------------------------------------------------------------------------------------------------------------------------ 60 NGC1851-OFF FOS/BL ACQ/PEA 0.25-PA G400H SCAN-STEP-Y=0.11,SCAN-STEP-X=0.11 1 4 S ONBOARD ACQ FOR 70 SET K IR-A ,SEARCH-SIZE-Y=4,SEARCH-SIZE-X=4 ------------------------------------------------------------------------------------------------------------------------------------ 70 NGC1851-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 3600 S R R-A Comments: BLIND OFFSET TO TARGET ------------------------------------------------------------------------------------------------------------------------------------ 6892( 5) - 08/12/96 15:20 - [ 4] Summary Form for Proposal 6892 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCAN-STEP-Y=1.23 SEARCH-SIZE-Y=3 SEARCH-SIZE-X=1 SEARCH-SIZE-X=6 SEARCH-SIZE-X=3 SEARCH-SIZE-X=4 STEP-PATT=SINGLE ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category AUG/FOS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 30 ONBOARD ACQ FOR 60 ONBOARD ACQ FOR 70 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G400H G160L ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1851-OFFSET NGC1851-STAR ------------------------------------------------------------------------------------------------------------------------------------