14639( 2) - 12-Jul-2016 11:18:24 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14639 Version: 2 Check-in Time: 12-Jul-2016 11:18:24 STScI Edit Number: 0 Title Finding AM CVn stars in 47 Tuc ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Thomas J. Maccarone Texas Tech University Y CoI: Prof. Christian Knigge University of Southampton N CoI: Dr. David R. Zurek American Museum of Natural History N CoI: Dr. Craig Heinke University of Alberta N CoI: Prof. Jay Strader Michigan State University N CoI: Dr. James Miller-Jones Curtin University N CoI: Dr. Laura Chomiuk Michigan State University N CoI: Dr. Gregory R. Sivakoff University of Alberta N CoI: Dr. Lennart van Haaften Texas Tech University N CoI: Dr. Natasha Ivanova University of Alberta N ------------------------------------------------------------------------------------ Abstract We propose to observe 47 Tuc in He I (using the redshifted H-alpha filter centered on 665 nm) and a relatively broad emission line filter for slightly higher redshift H-alpha at 680 nm to get a clean continuum measurement. These narrow band images will reveal sources in the cluster which are strong in one of the two filters, but not in the other. The objects strong in only H-alpha will be strong candidates for being cataclysmic variables, while the objects strong in only He I will be strong candidates to be ultracompact binaries -- accreting compact objects in which the donor star is a white dwarf. These objects are key tracers of whether globular clusters are important factories for making gravitational wave sources, and Type Ia supernovae. Furthermre, because AM CVn stars are the only class of objects which has a characteristic lifetime shorter than the dynamical evolution timescale of the cluster while also being likely to be numerous, developoing an approach for finding them also opens up the possibility of examining the historical evolution of the cores of globular clusters. ------------------------------------------------------------------------------------ Observations Description ------------------------ The proposal is to make narrow band images of the globular cluster 47 Tuc. The F665N filter will be used as a He I filter, while the F680N filter will be used as a continuum filter. The main goal is to search for hydrogen deficient stars like AM CVn stars. ------------------------------------------------------------------------------------ 14639( 2) - 12-Jul-2016 11:18:24 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-104 STELLAR CLUSTER, RA=00H24M5.3590S, J2000 V = 4.09 GLOBULAR CLUSTER DEC=-72D04'53.20" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14639( 2) - 12-Jul-2016 11:18:24 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 14639( 2) - 12-Jul-2016 11:18:24 - [ 4] Visit: 01 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-104 WFC3/UVI ACCUM UVIS F665N 1 717 S PATTERN 1 1 S (2868 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-104 WFC3/UVI ACCUM UVIS F680N 1 745 S PATTERN 1 2 S (2980 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-104 WFC3/UVI ACCUM UVIS F665N 1 745 S PATTERN 1 3 S (2980 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 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-104 1 WFC3/UVI ACCUM UVIS F665N 1 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 2 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 3 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 4 none none none 1 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 1 none none none 2 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 2 none none none 2 N/A S 14639( 2) - 12-Jul-2016 11:18:24 - [ 5] 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-104 2 WFC3/UVI ACCUM UVIS F680N 3 none none none 2 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 4 none none none 2 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 1 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 2 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 3 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 4 none none none 3 N/A S 14639( 2) - 12-Jul-2016 11:18:24 - [ 6] Visit: 02 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-104 WFC3/UVI ACCUM UVIS F665N 1 717 S PATTERN 1 1 S (2868 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-104 WFC3/UVI ACCUM UVIS F680N 1 745 S PATTERN 1 2 S (2980 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-104 WFC3/UVI ACCUM UVIS F665N 1 745 S PATTERN 1 3 S (2980 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 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-104 1 WFC3/UVI ACCUM UVIS F665N 1 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 2 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 3 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 4 none none none 1 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 1 none none none 2 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 2 none none none 2 N/A S 14639( 2) - 12-Jul-2016 11:18:24 - [ 7] 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-104 2 WFC3/UVI ACCUM UVIS F680N 3 none none none 2 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 4 none none none 2 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 1 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 2 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 3 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 4 none none none 3 N/A S 14639( 2) - 12-Jul-2016 11:18:24 - [ 8] Visit: 03 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-104 WFC3/UVI ACCUM UVIS F665N 1 717 S PATTERN 1 1 S (2868 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-104 WFC3/UVI ACCUM UVIS F680N 1 745 S PATTERN 1 2 S (2980 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-104 WFC3/UVI ACCUM UVIS F665N 1 745 S PATTERN 1 3 S (2980 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 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-104 1 WFC3/UVI ACCUM UVIS F665N 1 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 2 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 3 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 4 none none none 1 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 1 none none none 2 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 2 none none none 2 N/A S 14639( 2) - 12-Jul-2016 11:18:24 - [ 9] 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-104 2 WFC3/UVI ACCUM UVIS F680N 3 none none none 2 N/A S NGC-104 2 WFC3/UVI ACCUM UVIS F680N 4 none none none 2 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 1 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 2 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 3 none none none 3 N/A S NGC-104 3 WFC3/UVI ACCUM UVIS F665N 4 none none none 3 N/A S 14639( 2) - 12-Jul-2016 11:18:24 - [ 10] Visit: 04 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-104 WFC3/UVI ACCUM UVIS F665N 1 717 S PATTERN 1 1 S (2868 S) Comments: No flash has been added because the object is a globular cluster, and the wings of the PSFs of nearby stars will provide a background level typically equivalent to a 9 electron flash. ------------------------------------------------------------------------------------------------------------------------------------ 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-104 1 WFC3/UVI ACCUM UVIS F665N 1 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 2 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 3 none none none 1 N/A S NGC-104 1 WFC3/UVI ACCUM UVIS F665N 4 none none none 1 N/A S 14639( 2) - 12-Jul-2016 11:18:24 - [ 11] Summary Form for Proposal 14639 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F665N, F680N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-104 ------------------------------------------------------------------------------------------------------------------------------------