Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 3281c Report Date: 09-May-96:18:20 Version: ********** Check-in Date: ********** 1.Proposal Title: GLOBULAR CLUSTER CORE STRUCTURE AND DYNAMICS (FOS 36): FUTURE-CYCLE CONTINUATION ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR POPULATIONS GTO/FOS 1052 Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Ralph Bohlin SPACE TELESCOPE SCIENCE INST USA (301) 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. ------------------------------------------------------------------------------------ 8. Scientific Key Words: GLOBULAR CLUSTER ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 13.38 par: 0 10. Num targs pri: 18 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 3281c PI: Ralph Bohlin Proposal Title: GLOBULAR CLUSTER CORE STRUCTURE AND DYNAMICS (FOS 36): FUTURE-CYCLE CONTINUATION ------------------------------------------------------------------------------------ 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. Since the globular clusters are faint, use the low dispersion G160L and the Prism on the Blueside. Use the lower 0.3" aperture. The PC images are essential for target acquisition for the spectra. Offset the PC pointing to place the center of the G.C. (quoted coordinates) 10" off the pyramid along the centerline of the best CCD chip. We require two months between delivery of the PC images and the final specification of the FOS pointings. FOS target acquisition in mode III assumes that the PC is calibrated for astrometry to 0.03". PC filters are F230W, F336W, and F547M. Cycle 2: 204-205, 209-220 Cycle 9: 901-904 ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. The SV prerequisite programs for all FOS observations in this program are: Prop ID 2195 FOS Target Acquisition Tests - All observations Prop ID 1317 Int./Ext. Wavelength Offsets - 1st target Prop ID 1318 Spectral Flat Fields - 1st target Prop ID 1320 Absolute Spectrophotometry - 1st visit of bright targets All WF/PC imaging with a center wavelength blueward of 5000 Angstroms requires UV flood ------------------------------------------------------------------------------------ 12. This program does not become a viable scientific investigation until 5 of the 6 globular clusters have been observed by both the WFPC and FOS. No data should be made public sooner than 1 year after that time. ------------------------------------------------------------------------------------ 13. Use FOS spectra to investigate the structure and dynamics of the cores of globular clusters. Spectra on and just off the core will be obtained for clusters with and without cusps and with and without central x-ray sources. ------------------------------------------------------------------------------------ 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: (301) 338-4804 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3281c [ 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 GLOBULAR CLUSTER WITH RA=5H 12M 28.03S +/- 0.7", 1950 1 F(1500)=2.5 E-15 CORE RADIUS=5.9" DEC=-40D 06' 11.4" +/- 0.7" 2 SURF(V)=14.7 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1851- OFFSET FROM CORE TBD-EARLY, STAR1 RA-OFF=0S +/- 5.23S, DEC-OFF=+0' +/- 1', FROM 1 Comments: POSITIONS FOR THE "STAR1,2" TARGETS WILL BE DETERMINED FROM THE PC IMAGES. ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1851- OFFSET FROM CORE TBD-EARLY, STAR2 RA-OFF=0S +/- 5.23S, DEC-OFF=+0' +/- 1', FROM 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC6093 M80 G.C. WITH CORE=6" RA=16H 14M 03.41S +/- 1", 1950 1 SURF(V)=14.4 DEC=-22D 51' 13.1" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC6093- OFFSET FROM CORE TBD-EARLY, STAR1 RA-OFF=0S +/- 4.34S, DEC-OFF=+0' +/- 1', FROM 4 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC6093- OFFSET FROM CORE TBD-EARLY, STAR2 RA-OFF=0S +/- 4.34S, DEC-OFF=+0' +/- 1', FROM 4 ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC6205 M13 G.C. WITH CORE=46" RA=16H 39M 53.28S +/- 1", 1950 1 SURF(V)=16.7 DEC=+36D 33' 11.5" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC6205- OFFSET FROM CORE TBD-EARLY, STAR1 RA-OFF=0S +/- 4.98S, DEC-OFF=+0' +/- 1', FROM 7 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC6205- OFFSET FROM CORE TBD-EARLY, STAR2 RA-OFF=0S +/- 4.98S, DEC-OFF=+0' +/- 1', FROM 7 ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC6681 M70 G.C. WITH UNKNOWN CORE RA=18H 39M 57.31S +/- 1", 1950 1 SURF(V)=15.1 RADIUS DEC=-32D 20' 32.3" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC6681- OFFSET FROM CORE TBD-EARLY, STAR1 RA-OFF=0S +/- 4.73S, DEC-OFF=+0' +/- 1', FROM 10 ------------------------------------------------------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3281c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 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| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC6681- OFFSET FROM CORE TBD-EARLY, STAR2 RA-OFF=0S +/- 4.73S, DEC-OFF=+0' +/- 1', FROM 10 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC7078 M15 G.C. WITH 5.5" CORE RA=21H 27M 33.40S +/- 0.5", 1950 1 F(1500)=1.4 E-15 DEC=+11D 56' 48.9" +/- 0.5" 2 SURF(V)=15.1 ------------------------------------------------------------------------------------------------------------------------------------ 14 NGC7078- OFFSET FROM CORE TBD-EARLY, STAR1 RA-OFF=0S +/- 4.09S, DEC-OFF=+0' +/- 1', FROM 13 ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC7078- OFFSET FROM CORE TBD-EARLY, STAR2 RA-OFF=0S +/- 4.09S, DEC-OFF=+0' +/- 1', FROM 13 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC1851- OFFSET STAR TBD-EARLY, OFFSET-STAR RA-OFF=0S +/- 5.23S, DEC-OFF=+0' +/- 1', FROM 1 ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC6093- OFFSET STAR TBD-EARLY, OFFSET-STAR RA-OFF=0S +/- 4.34S, DEC-OFF=+0' +/- 1', FROM 4 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC6205- OFFSET STAR TBD-EARLY, OFFSET-STAR RA-OFF=0S +/- 4.98S, DEC-OFF=+0' +/- 1', FROM 7 ------------------------------------------------------------------------------------------------------------------------------------ 19 NGC6681- OFFSET STAR TBD-EARLY, OFFSET-STAR RA-OFF=0S +/- 4.73S, DEC-OFF=+0' +/- 1', FROM 10 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC7078- OFFSET STAR TBD-EARLY, OFFSET-STAR RA-OFF=0S +/- 4.09S, DEC-OFF=+0' +/- 1', FROM 13 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3281c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 201 DEFINE # PC IMAGE ALL F230W CR-SPLIT=0.1 1 250S # GROUP 201-203 PC PRE-FLASH=YES WITHIN 15D SAME POS FOR 202- 203 AS 201 Comments: THE PC ACQUISITION ASSUMES AN ASTROMETRIC CALIBRATION OF THE PC WITH 0".03 ACCURACY. ------------------------------------------------------------------------------------------------------------------------------------ 202 DEFINE # PC IMAGE ALL F336W CR-SPLIT=0.1 1 130S # PC PRE-FLASH=YES ------------------------------------------------------------------------------------------------------------------------------------ 203 DEFINE # PC IMAGE ALL F547M CR-SPLIT=0.1 1 100S # PC PRE-FLASH=YES ------------------------------------------------------------------------------------------------------------------------------------ 204 USE PC NGC6093 X2.0 2 EARLY ACQ FOR 212- 214 COND IF UV BRIGHT OBJECT FOUND GUID TOL 0.020" / 204-205 Comments: COND ON 4-5 IF UV BRIGHT OBJECT CYCLE 2 / 204-205 FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ 205 USE PC NGC6681 X2.0 2 EARLY ACQ FOR 218- 220 COND IF UV BRIGHT OBJECT FOUND COND IF TAC OK Comments: COND ON 4-5 IF UV BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 206 DEFINE # FOS/BL ACQ/ 4.3 MIRROR BRIGHT=660000 1 5S # ACQ BINARY Comments: EXP. TIMES OF ALL OFFSET STARS WILL BE REVISED. ------------------------------------------------------------------------------------------------------------------------------------ 207 DEFINE # FOS/BL ACCUM 0.3 G160L 1 1300S # FOS ------------------------------------------------------------------------------------------------------------------------------------ 208 DEFINE # FOS/BL ACCUM 0.3 PRISM 1 400S # FOS ------------------------------------------------------------------------------------------------------------------------------------ 209 USE ACQ NGC1851- X2.0 1 ONBOARD ACQ FOR OFFSET-STAR 210-211 GROUP 209-211 WITHIN 15D REQ UPDATE COND IF UV BRIGHT Comments: NEEDS EXPOSURE TIME UPDATE. REQ OBJECT FOUND DATA FROM 4. COND ON 4 IF UV CYCLE 2 / 209-220 BRIGHT OBJECT FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3281c [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 210 USE FOS NGC1851- X2.0 1 COND IF UV BRIGHT STAR1 OBJECT FOUND COND IF TAC OK Comments: COND ON 4 IF UV BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 211 USE FOS NGC1851- X2.0 1 COND IF UV BRIGHT STAR2 OBJECT FOUND COND IF TAC OK Comments: COND ON 4 IF UV BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 212 USE ACQ NGC6093- X2.0 2 ONBOARD ACQ FOR OFFSET-STAR 213-214 GROUP 212-214 WITHIN 15D REQ DATA FROM 204 COND ON 204 IF UV Comments: NEEDS EXPOSURE TIME UPDATE BRIGHT OBJECT FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ 213 USE FOS NGC6093- X2.0 2 COND ON 204 IF UV STAR1 BRIGHT OBJECT FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ 214 USE FOS NGC6093- X2.0 2 COND ON 204 IF UV STAR2 BRIGHT OBJECT FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ 215 USE ACQ NGC6205- X2.0 1 ONBOARD ACQ FOR OFFSET-STAR 216-217 GROUP 215-217 WITHIN 15D REQ UPDATE COND IF UV BRIGHT Comments: NEEDS EXPOSURE TIME UPDATE. REQ OBJECT FOUND DATA FROM 5. COND ON 5 IF UV COND IF TAC OK BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 216 USE FOS NGC6205- X2.0 1 COND IF UV BRIGHT STAR1 OBJECT FOUND COND IF TAC OK Comments: COND ON 5 IF UV BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3281c [ 7] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 217 USE FOS NGC6205- X2.0 1 COND IF UV BRIGHT STAR2 OBJECT FOUND COND IF TAC OK Comments: COND ON 5 IF UV BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 218 USE ACQ NGC6681- X2.0 3 ONBOARD ACQ FOR OFFSET-STAR 219-220 GROUP 219-220 WITHIN 15D REQ DATA FROM 205 COND ON 205 IF UV Comments: NEEDS EXPOSURE TIME UPDATE BRIGHT OBJECT FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ 219 USE FOS NGC6681- X2.0 3 COND ON 205 IF UV STAR1 BRIGHT OBJECT FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ 220 USE FOS NGC6681- X2.0 3 COND ON 205 IF UV STAR2 BRIGHT OBJECT FOUND COND IF TAC OK ------------------------------------------------------------------------------------------------------------------------------------ 901 USE PC NGC7078 1 EARLY ACQ FOR 902- 904 COND IF UV BRIGHT OBJECT FOUND CYCLE 9 / 901-904 Comments: COND ON 4-5 IF UV BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 902 USE ACQ NGC7078- 1 ONBOARD ACQ FOR OFFSET-STAR 903-904 GROUP 219-220 WITHIN 15D REQ DATA FROM 901 COND ON 901 IF UV Comments: NEEDS EXPOSURE TIME UPDATE BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 903 USE FOS NGC7078- 1 COND ON 901 IF UV STAR1 BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ 904 USE FOS NGC7078- 1 COND ON 901 IF UV STAR2 BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 3281c [ 8] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations PC FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ACQ/BINARY ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.1 PRE-FLASH=YES BRIGHT=660000 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/FOS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 13.38 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 201-203 WITHIN 15D; SAME POS FOR 202-203 AS 201 EARLY ACQ FOR 212-214; COND IF UV BRIGHT OBJECT FOUND; GUID TOL 0.020" / 204-205; CYCLE 2 / 204-205; COND IF TAC OK EARLY ACQ FOR 218-220; ONBOARD ACQ FOR 210-211; GROUP 209-211 WITHIN 15D; REQ UPDATE; CYCLE 2 / 209-220; ONBOARD ACQ FOR 213-214; GROUP 212-214 WITHIN 15D; REQ DATA FROM 204; COND ON 204 IF UV BRIGHT ONBOARD ACQ FOR 216-217; GROUP 215-217 WITHIN 15D; ONBOARD ACQ FOR 219-220; GROUP 219-220 WITHIN 15D; REQ DATA FROM 205; COND ON 205 IF UV BRIGHT EARLY ACQ FOR 902-904; CYCLE 9 / 901-904 ONBOARD ACQ FOR 903-904; REQ DATA FROM 901; COND ON 901 IF UV BRIGHT OBJECT FOUND ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F230W F336W F547M MIRROR G160L PRISM ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1851 NGC1851-STAR1 NGC1851-STAR2 NGC6093 M80 NGC6093-STAR1 NGC6093-STAR2 NGC6205 M13 NGC6205-STAR1 NGC6205-STAR2 NGC6681 M70 NGC6681-STAR1 NGC6681-STAR2 NGC7078 M15 NGC7078-STAR1 NGC7078-STAR2 NGC1851-OFFSET-STAR NGC6093-OFFSET-STAR NGC6205-OFFSET-STAR NGC6681-OFFSET-STAR NGC7078-OFFSET-STAR ------------------------------------------------------------------------------------------------------------------------------------