11125( 4) - 06/08/07 12:27 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11125 Version: 4 Check-in Time: 08-Jun-2007 16:27:17 STScI Edit Number: 0 Title The Dynamical Evolution of Globular Clusters ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 16 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Joel N. Bregman University of Michigan CoI: Dr. Mario L. Mateo University of Michigan N CoI: Dr. Patrick O. Seitzer University of Michigan N ------------------------------------------------------------------------------------ Abstract Globular clusters evolve through dynamical interactions, with primordial binaries extending the time until core collapse by up to an order of magnitude, depending on the initial binary fraction. These dynamical interactions plus mass segregation causes the binary fraction to rise in the core but fall at larger radii. We hope to eventually test these broad predictions by comparing them to the binary properties for globular clusters at different states of evolution, defined by the ratio of their age to the dynamical relaxation time at the half-light radius. The most important unknown aspects in the modeling process are the initial conditions of binaries in the cluster. Here we propose to determine the initial binary fraction as a function of radius by studying three of the dynamically youngest globular clusters (NGC 5053, NGC 5466, and NGC 5897). The presence of binaries thickens the Main Sequence in a color-magnitude diagram, which can be detected with deep multicolor images. ------------------------------------------------------------------------------------ Observations Description ------------------------ For NGC 5053, NGC 5466 and NGC 5897, we will obtain off-center imaging observations in F606W (2 orbits per object) and F814W (4 orbits per object). For each of these three clusters, a single field will be imaged. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11125( 4) - 06/08/07 12:27 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5053-N STELLAR CLUSTER, RA=13H16M27.0000S +/- 0.1", J2000 V = 9.5+/-0.1 GLOBULAR CLUSTER DEC=+17D45'14.00" +/- 0.1" Reference Frame: Other: NED Comments: This object was generated by the targetselector and retrieved from the NED database. 2 NGC-5466-N STELLAR CLUSTER, RA=14H05M27.3000S +/- 0.1", J2000 V = 9.0+/-0.1 GLOBULAR CLUSTER DEC=+28D35'6.00" +/- 0.1" Reference Frame: Other: NED Comments: This object was generated by the targetselector and retrieved from the NED database. 3 NGC-5897-S STELLAR CLUSTER, RA=15H17M24.4000S +/- 0.1", J2000 V = 8.5+/-0.1 GLOBULAR CLUSTER DEC=-21D03'58.00" +/- 0.1" Reference Frame: Other: NED Comments: This object was generated by the targetselector and retrieved from the NED database. 11125( 4) - 06/08/07 12:27 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFPC2-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.559017 Line_Spacing 0.559017 Coordinate_Frame POS-TARG Pattern_Orient 26.56505 Angle_Between_Sides 143.130102 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11125( 4) - 06/08/07 12:27 - [ 4] Visit: 02 Visit Priority: Visit Requirements: 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-5466-N WFPC2 IMAGE WFALL F606W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5466-N 1 WFPC2 IMAGE WFALL F606W 1 none none none 1 N/A NGC-5466-N 1 WFPC2 IMAGE WFALL F606W 2 none none none 1 N/A NGC-5466-N 1 WFPC2 IMAGE WFALL F606W 3 none none none 2 N/A NGC-5466-N 1 WFPC2 IMAGE WFALL F606W 4 none none none 2 N/A 11125( 4) - 06/08/07 12:27 - [ 5] Visit: 03 Visit Priority: Visit Requirements: 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-5897-S WFPC2 IMAGE WFALL F606W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5897-S 1 WFPC2 IMAGE WFALL F606W 1 none none none 1 N/A NGC-5897-S 1 WFPC2 IMAGE WFALL F606W 2 none none none 1 N/A NGC-5897-S 1 WFPC2 IMAGE WFALL F606W 3 none none none 2 N/A NGC-5897-S 1 WFPC2 IMAGE WFALL F606W 4 none none none 2 N/A 11125( 4) - 06/08/07 12:27 - [ 6] Visit: 04 Visit Priority: Visit Requirements: 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-5053-N WFPC2 IMAGE WFALL F606W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5053-N 1 WFPC2 IMAGE WFALL F606W 1 none none none 1 N/A NGC-5053-N 1 WFPC2 IMAGE WFALL F606W 2 none none none 1 N/A NGC-5053-N 1 WFPC2 IMAGE WFALL F606W 3 none none none 2 N/A NGC-5053-N 1 WFPC2 IMAGE WFALL F606W 4 none none none 2 N/A 11125( 4) - 06/08/07 12:27 - [ 7] Visit: 05 Visit Priority: Visit Requirements: SAME ORIENT AS 04 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-5053-N WFPC2 IMAGE WFALL F814W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-5053-N WFPC2 IMAGE WFALL F814W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5053-N 1 WFPC2 IMAGE WFALL F814W 1 none none none 1 N/A NGC-5053-N 1 WFPC2 IMAGE WFALL F814W 2 none none none 1 N/A NGC-5053-N 1 WFPC2 IMAGE WFALL F814W 3 none none none 2 N/A NGC-5053-N 1 WFPC2 IMAGE WFALL F814W 4 none none none 2 N/A NGC-5053-N 2 WFPC2 IMAGE WFALL F814W 1 none none none 3 N/A NGC-5053-N 2 WFPC2 IMAGE WFALL F814W 2 none none none 3 N/A NGC-5053-N 2 WFPC2 IMAGE WFALL F814W 3 none none none 4 N/A NGC-5053-N 2 WFPC2 IMAGE WFALL F814W 4 none none none 4 N/A 11125( 4) - 06/08/07 12:27 - [ 8] Visit: 06 Visit Priority: Visit Requirements: SAME ORIENT AS 02 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-5466-N WFPC2 IMAGE WFALL F814W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-5466-N WFPC2 IMAGE WFALL F814W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5466-N 1 WFPC2 IMAGE WFALL F814W 1 none none none 1 N/A NGC-5466-N 1 WFPC2 IMAGE WFALL F814W 2 none none none 1 N/A NGC-5466-N 1 WFPC2 IMAGE WFALL F814W 3 none none none 2 N/A NGC-5466-N 1 WFPC2 IMAGE WFALL F814W 4 none none none 2 N/A NGC-5466-N 2 WFPC2 IMAGE WFALL F814W 1 none none none 3 N/A NGC-5466-N 2 WFPC2 IMAGE WFALL F814W 2 none none none 3 N/A NGC-5466-N 2 WFPC2 IMAGE WFALL F814W 3 none none none 4 N/A NGC-5466-N 2 WFPC2 IMAGE WFALL F814W 4 none none none 4 N/A 11125( 4) - 06/08/07 12:27 - [ 9] Visit: 07 Visit Priority: Visit Requirements: SAME ORIENT AS 03 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-5897-S WFPC2 IMAGE WFALL F814W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-5897-S WFPC2 IMAGE WFALL F814W ATD-GAIN=15,CR-SPLIT=NO 1 1100 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5897-S 1 WFPC2 IMAGE WFALL F814W 1 none none none 1 N/A NGC-5897-S 1 WFPC2 IMAGE WFALL F814W 2 none none none 1 N/A NGC-5897-S 1 WFPC2 IMAGE WFALL F814W 3 none none none 2 N/A NGC-5897-S 1 WFPC2 IMAGE WFALL F814W 4 none none none 2 N/A NGC-5897-S 2 WFPC2 IMAGE WFALL F814W 1 none none none 3 N/A NGC-5897-S 2 WFPC2 IMAGE WFALL F814W 2 none none none 3 N/A NGC-5897-S 2 WFPC2 IMAGE WFALL F814W 3 none none none 4 N/A NGC-5897-S 2 WFPC2 IMAGE WFALL F814W 4 none none none 4 N/A 11125( 4) - 06/08/07 12:27 - [ 10] Summary Form for Proposal 11125 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFALL ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ATD-GAIN=15 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1; SAME ORIENT AS 04; PATTERN 1 2; SAME ORIENT AS 02; SAME ORIENT AS 03; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-5466-N NGC-5897-S NGC-5053-N ------------------------------------------------------------------------------------------------------------------------------------