Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5696 Report Date: 27-Jul-95:13:53 Version: ********** Check-in Date: ********** 1.Proposal Title: GLOBULAR CLUSTER CORE STRUCTURE AND DYNAMICS (FOS 36) - CYCLE 4 CARRYOVER ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR POPULATIONS AUG/FOS 4832 Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Ralph Bohlin SPACE TELESCOPE SCIENCE INST USA (410) 338-4804 ------------------------------------------------------------------------------------ 7. 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.) ------------------------------------------------------------------------------------ 8. Scientific Key Words: GLOBULAR CLUSTER ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 4.68 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5696 PI: Ralph Bohlin Proposal Title: GLOBULAR CLUSTER CORE STRUCTURE AND DYNAMICS (FOS 36) - CYCLE 4 CARRYOVER ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Edward Beaver UC, SAN DIEGO USA E. Margaret Burbidge UC, SAN DIEGO USA Bruce Margon WASHINGTON, UNIVERSITY OF USA Lyman Spitzer Jr. PRINCETON UNIVERSITY USA J. Roger P. Angel ARIZONA, UNIVERSITY OF USA Frank Bartko APPLIED RESEARCH CORPORATION USA Arthur F. Davidsen JOHNS HOPKINS UNIVERSITY USA Richard J. Harms APPLIED RESEARCH CORPORATION USA Ralph Bohlin SPACE TELESCOPE SCIENCE USA INSTITUTE Holland C. Ford SPACE TELESCOPE SCIENCE USA INSTITUTE ------------------------------------------------------------------------------------ 3. Description of proposed observations. FOS spectra of UV-bright stars in 2 globular clusters will be obtained in low res gratings. The coordinates are derived from WFPC1 and WFPC2 images. WFPC2 images are needed to confirm NGC 1851 candidate prior to FOS spectra. ------------------------------------------------------------------------------------ 11. Address Information Name: RALPH BOHLIN Category: PI Institution: SPACE TELESCOPE SCIENCE INSTITUTE Address: HOMEWOOD CAMPUS City: BALTIMORE State: MD Zip Code: 21218 Country: USA Telephone: (410) 338-4804 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5696 [ 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 NGC1851 C,201,A,165 RA = 05H 14M 06.43S +/- J2000 1 SURF(V) = 14.7 +/-3.0 .15S, DEC = -40D 02' 43.0" +/- 1.0" Comments: GLOBULAR CLUSTER WITH UV/X-RAY SOURCE. POSITION COMPROMISE BETWEEN X-RAY CANDIDATE AND CLUSTER CENTER. ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1851- A,140 RA = 05H 14M 06.865S +/- J2000 1 V = 13.3+/-0.2, B-V = 1.4+/-0.2 OFFSET 0.01S, DEC = -40D 02' 31.81" +/- 0.01" Comments: POSITION WILL BE CONFIRMED FROM WFPC2 (ALREADY MEASURED IN WFPC1) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1851-STAR I,604,605 RA-OFF = -0.505S +/- 2.0S, 1 V = 16.2+/- 5, B-V = 0.1+/-1.5 DEC-OFF = -4.10" +/- 30", FROM 2 Comments: POSITION AND FLUXES WILL BE UPDATED FROM WFPC2 IMAGES ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5696 [ 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 NGC1851 WFPC2 IMAGE PC1-FIX F336W 3363 CR-SPLIT=NO 2 900S 1 1 SEQ 1-2.25 NO GAP NON-INT / 1-2.25 CYCLE 4 / 1-2.25 Comments: PC PICTURES FOR FOS EARLY-ACQ. WFPC2 IMAGES SHARED WITH GO PROGRAM 6095 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1851 WFPC2 IMAGE PC1-FIX F439W 4385 CR-SPLIT=NO 4 300S 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2.25 NGC1851 WFPC2 IMAGE PC1-FIX F336W 3363 CR-SPLIT=NO 2 900S 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 401 NGC1851- FOS/RD ACQ/ 4.3 G570H SEARCH-SIZE-X=1 1 2S 1 ONBOARD ACQ FOR OFFSET PEAK SEARCH-SIZE-Y=3 402 SCAN-STEP- CYCLE 4 / 401-406 Y=1.23 REQ UPDATE Comments: ACQUIRE THE OFFSET STAR. THE EXPOSURE TIME AND POSITION ARE BASED ON AN EARLY-ACQ WFPC1 IMAGE. BUT WILL BE CONFIRMED FROM WFPC2. ------------------------------------------------------------------------------------------------------------------------------------ 402 NGC1851- FOS/RD ACQ/ 1.0 G570H SEARCH-SIZE-X=6 1 2S 1 ONBOARD ACQ FOR OFFSET PEAK SEARCH-SIZE-Y=2 402.5 SCAN-STEP- X=0.61 SCAN-STEP- Y=0.61 ------------------------------------------------------------------------------------------------------------------------------------ 402.5 NGC1851- FOS/RD ACQ/ 0.5 G570H SEARCH-SIZE-X=3 1 3S 1 ONBOARD ACQ FOR OFFSET PEAK SEARCH-SIZE-Y=3 403 SCAN-STEP- X=0.29 SCAN-STEP- Y=0.29 ------------------------------------------------------------------------------------------------------------------------------------ 403 NGC1851- FOS/RD ACQ/ 0.3 G570H SEARCH-SIZE-X=4 1 3S 1 ONBOARD ACQ FOR OFFSET PEAK SEARCH-SIZE-Y=4 404 SCAN-STEP- X=0.11 SCAN-STEP- Y=0.11 ------------------------------------------------------------------------------------------------------------------------------------ 404 NGC1851- FOS/RD ACCUM 0.5- G570H STEP- 1 600S 1 SEQ 404-406 NO GAP STAR PAIR-A PATT=SINGLE Comments: BLIND OFFSET TO TARGET ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5696 [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 405 NGC1851- FOS/BL ACQ/ 0.25- G400H SEARCH-SIZE-X=4 1 4S 1 ONBOARD ACQ FOR OFFSET PEAK PAIR-A SEARCH-SIZE-Y=4 406 SCAN-STEP- X=0.11 SCAN-STEP- Y=0.11 STEP- PATT=SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 406 NGC1851- FOS/BL ACCUM 0.5- G160L STEP- 1 2000S 1 STAR PAIR-A PATT=SINGLE Comments: BLIND OFFSET TO TARGET AFTER PU ON BLUE SIDE ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5696 [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 FOS/RD FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO SEARCH-SIZE-X=1 SEARCH-SIZE-Y=3 SCAN-STEP-Y=1.23 SEARCH-SIZE-X=6 SEARCH-SIZE-Y=2 SCAN-STEP-X=0.61 SCAN-STEP-Y=0.61 SEARCH-SIZE-X=3 SCAN-STEP-X=0.29 SCAN-STEP-Y=0.29 SEARCH-SIZE-X=4 SEARCH-SIZE-Y=4 SCAN-STEP-X=0.11 SCAN-STEP-Y=0.11 STEP-PATT=SINGLE ------------------------------------------------------------------------------------------------------------------------------------ Proposal for AUG/FOS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 4.68 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SEQ 1-2.25 NO GAP; NON-INT / 1-2.25; CYCLE 4 / 1-2.25; ONBOARD ACQ FOR 402; CYCLE 4 / 401-406; REQ UPDATE; ONBOARD ACQ FOR 402.5 ONBOARD ACQ FOR 403 ONBOARD ACQ FOR 404 SEQ 404-406 NO GAP; ONBOARD ACQ FOR 406 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W F439W G570H G400H G160L ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1851 NGC1851-OFFSET NGC1851-STAR ------------------------------------------------------------------------------------------------------------------------------------