Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 4063c Report Date: 09-May-96:19:08 Version: ********** Check-in Date: ********** 1.Proposal Title: GLOBULAR CLUSTER CORE STRUCTURE AND DYNAMICS (FOS 36) AUGMENTATION: CYCLE 2 OBSERVATIONS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR POPULATIONS AUG/FOS 3651 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: 4.63 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 4063c PI: Ralph Bohlin Proposal Title: GLOBULAR CLUSTER CORE STRUCTURE AND DYNAMICS (FOS 36) AUGMENTATION: CYCLE 2 OBSERVATIONS ------------------------------------------------------------------------------------ 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. PC filters are F336W, and F547M. Cycle 2: 203-205 ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The high spatial resolution is required to resolve the interesting structure in the cores of the globular clusters. We have obtained ground based CCD images of the targets for comparison. ------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. The images will be examined for UV-bright objects in the ratios of the PC images in different bandpasses as a quick look analysis. A more detailed examination of the images will come from a DAOPHOT analysis of the PC photometry of all of the stars. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. 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. The PC and WFC images will be measured for precise target coordinates, so that the FOS observations can be done as blind offsets from a nearby isolated star. ------------------------------------------------------------------------------------ 9. Description of previous HST work. All GTO/FOS programs. Programs GTO/FOS 1052 and continuation program GTO/FOS 3281 are related. Page 3 ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). The computer facilities and research assistance for this work have been funded entirely by grants, except for: 1. Easy access to the public GSSS resources. 2. Occassional use of the Celco image production capabilities for publication quality hardcopies. ------------------------------------------------------------------------------------ 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 = 4063c [ 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| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC6093 M80 C,201 RA=16H 14M 03.4S +/- 1", 1950 1 SURF(V)=14.4 DEC=-22D 51' 09.2" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC6681 M70 C,201 RA=18H 39M 57.31S +/- 1", 1950 1 SURF(V)=15.1 DEC=-32D 20' 32.3" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4063c [ 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 NGC6093 PC IMAGE PCALL F336W CR-SPLIT=0.5 1 4000S 1 GROUP 201-203 NO PRE-FLASH=YES GAP SAME POS FOR 202- 203 AS 201 CYCLE 2 / 201-205 Comments: EXPOSURE TIMES FOR SCIENCE EXPOSURES IN THIS PROPOSAL MAY BE CHANGED BY UP TO +/- 20% TO INCREASE S/C EFF. ------------------------------------------------------------------------------------------------------------------------------------ 202 NGC6093 PC IMAGE PCALL F547M CR-SPLIT=0.5 1 200S 1 PRE-FLASH=YES Comments: EARLY ACQ FOR EXPOSURES IN LATER CYCLES ------------------------------------------------------------------------------------------------------------------------------------ 203 NGC6093 PC IMAGE PCALL F547M CR-SPLIT=NO 1 1000S 1 PRE-FLASH=YES Comments: EARLY ACQ FOR EXPOSURES IN LATER CYCLES ------------------------------------------------------------------------------------------------------------------------------------ 204 NGC6681 PC IMAGE PCALL F336W CR-SPLIT=0.5 1 4000S 1 GROUP 204-205 NO PRE-FLASH=YES GAP SAME POS FOR 205 AS 204 Comments: EARLY ACQ FOR EXPOSURES IN LATER CYCLES ------------------------------------------------------------------------------------------------------------------------------------ 205 NGC6681 PC IMAGE PCALL F547M CR-SPLIT=0.5 1 200S 1 PRE-FLASH=YES Comments: EARLY ACQ FOR EXPOSURES IN LATER CYCLES ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 4063c [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations PC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.5 PRE-FLASH=YES CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal for AUG/FOS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 4.63 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 201-203 NO GAP; SAME POS FOR 202-203 AS 201; CYCLE 2 / 201-205 GROUP 204-205 NO GAP; SAME POS FOR 205 AS 204 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W F547M ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC6093 M80 NGC6681 M70 ------------------------------------------------------------------------------------------------------------------------------------