10350( 2) - 09/24/04 11:01 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10350 Version: 2 Check-in Date: 24-Sep-2004 15:00:35 1.Proposal Title: X-ray Binaries in the Ultrahigh Collision Rate Globular Cluster NGC 6388 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Haldan N. Cohn Indiana University System CoI: Dr. Phyllis M. Lugger Indiana University System N CoI: Prof. Jonathan E. Grindlay Harvard University N CoI: Dr. Craig O. Heinke Northwestern University N CoI: Dr. Peter D. Edmonds Harvard University N CoI: Dr. Gordon A. Drukier Yale University N CoI: Dr. Charles D. Bailyn Yale University N ------------------------------------------------------------------------------------ 6. Abstract We propose a joint Chandra-HST study of the massive, high density globular cluster NGC 6388 to study its large expected populations of quiescent low-mass X-ray binaries (qLMXBs) and bright cataclysmic variables (CVs), and to test for the presence of an intermediate-mass black hole (IMBH). NGC 6388 has the highest predicted X-ray binary production rate of any Galactic cluster. The qLMXBs will be used to constrain neutron star accretion models, and neutron star masses and radii. The CVs will be used to investigate the effects of cluster structure, metallicity, initial binary fraction, and dynamical history on accreting binary populations. The proposed 3 orbits of HST U-band imaging would complement deep HST V and I-band imaging, already in-hand, for identifying Chandra sources. ------------------------------------------------------------------------------------ 10350( 2) - 09/24/04 11:01 - [ 2] Observations Description ------------------------ Our principal exposures are six F330W exposures, two per orbit, 1266 s for the first orbit and 1314 s for the remaining orbits. Our six-pointing dither pattern combines a two-pixel offset with subpixel (1/6th pixel) offsets. At the beginning of each orbit we take a 155 s F555W exposure, to search for strong variability wtih respect to the GO9835 observations of this cluster, and ensure simultaneous colors for bright objects. We have restricted the orientation to be within 5 degrees of the GO9835 data in order to maximize the overlap with that dataset. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10350( 2) - 09/24/04 11:01 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6388 STELLAR CLUSTER, RA=17H36M17.1600S +/- 0.1", J2000 V = 7.4 GLOBULAR CLUSTER DEC=-44D44'8.20" +/- 0.1" Coordinate Source: HST_IMAGE Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 10350( 2) - 09/24/04 11:01 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 285.0D TO 295.0 D; ORIENT 105.0D TO 115.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6388 ACS/HRC ACCUM HRC F555W CR-SPLIT=NO,GAIN=4 1 155 S ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6388 ACS/HRC ACCUM HRC F330W CR-SPLIT=NO,GAIN=2 1 1266 S POS TARG 0, 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6388 ACS/HRC ACCUM HRC F330W CR-SPLIT=NO,GAIN=2 1 1266 S POS TARG 0.061, 0.014 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6388 ACS/HRC ACCUM HRC F555W CR-SPLIT=NO,GAIN=4 1 155 S SAME POS AS 5 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6388 ACS/HRC ACCUM HRC F330W CR-SPLIT=NO,GAIN=2 1 1314 S POS TARG -0.047, 0.012 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6388 ACS/HRC ACCUM HRC F330W CR-SPLIT=NO,GAIN=2 1 1314 S POS TARG 0.014, 0.055 ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6388 ACS/HRC ACCUM HRC F555W CR-SPLIT=NO,GAIN=4 1 155 S SAME POS AS 8 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6388 ACS/HRC ACCUM HRC F330W CR-SPLIT=NO,GAIN=2 1 1314 S POS TARG 0.08, 0.07 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6388 ACS/HRC ACCUM HRC F330W CR-SPLIT=NO,GAIN=2 1 1314 S POS TARG -0.038, 0.067 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 01 1 none none none none 1 tbd 01 2 none none none none 1 tbd 01 3 none none none none 1 tbd 01 4 none none none none 2 tbd 01 5 none none none none 2 tbd 01 6 none none none none 2 tbd 01 7 none none none none 3 tbd 01 8 none none none none 3 tbd 01 9 none none none none 3 tbd 10350( 2) - 09/24/04 11:01 - [ 5] Summary Form for Proposal 10350 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures HRC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/HRC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO GAIN=4 GAIN=2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 285.0D TO 295.0 D; ORIENT 105.0D TO 115.0 D POS TARG 0, 0 POS TARG 0.061, 0.014 SAME POS AS 5 POS TARG -0.047, 0.012 POS TARG 0.014, 0.055 SAME POS AS 8 POS TARG 0.08, 0.07 POS TARG -0.038, 0.067 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F330W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-6388 ------------------------------------------------------------------------------------------------------------------------------------