12669( 3) - 16-Jun-2011 13:43:06 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12669 Version: 3 Check-in Time: 16-Jun-2011 13:43:06 STScI Edit Number: 2 Title Exploring the Bottom End of the White Dwarf Cooling Sequence in the Open Cluster NGC6819 ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Luigi R. Bedin Space Telescope Science Institute - ESA CoI: Dr. Maurizio Salaris Liverpool John Moores University N CoI: Prof. Giampaolo Piotto Universita di Padova N CoI: Dr. Ivan R. King University of Washington N CoI: Dr. Jay Anderson Space Telescope Science Institute N CoI: Dr. Santi Cassisi INAF, Osservatorio Astronomico di Teramo N ------------------------------------------------------------------------------------ Abstract The recent discovery by our group of an unexpectedly bright end of the white-dwarf (WD) luminosity function (LF) of the metal-rich, old open cluster NGC 6791 casts serious doubts on our understanding of the physical process which rules the formation and the cooling of WDs. It is clear at this point that the theory badly needs more observations. Here we propose WFC3/UVIS and ACS/WFC HST observations reaching the bottom end of the WD LF, for the first time in a solar-metallicity, 2.5-Gyr-old, populous open cluster: NGC 6819. ------------------------------------------------------------------------------------ Observations Description ------------------------ This is also a two-epoch astrometric program. The first epoch is in this Cycle17, for which we were allocated with 8 orbits. It is important to collect the first epoch data as soon as possible (ideally before the end of 2008, or as soon as possible in any case) so to enlarge the time-base-line when the second epoch will be collected (4 orbits in Cycle 19). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12669( 3) - 16-Jun-2011 13:43:06 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6819-SHI STELLAR CLUSTER, OPEN RA=19H41M17.7000S +/- 0.1", J2000 V = 25 +/- 2 FTED CLUSTER DEC=+40D11'13.20" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. + plus a shift ------------------------------------------------------------------------------------------------------------------------------------ 12669( 3) - 16-Jun-2011 13:43:06 - [ 3] Visit: 01 Visit Requirements: ORIENT 79D TO 81 D; AFTER 30-SEP-2012:23:59:59 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-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 10 S POS TARG -120, -120 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG -120, -120; PAR IFTED S ER 3 WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 466 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG -100, -80 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 670 S POS TARG -60, -60; PAR 6 IFTED S ER WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 490 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 606 S POS TARG -80, -100; PAR IFTED S ER 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 480 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 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-6819-SHIFTED 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 2 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 3 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 5 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 6 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 12669( 3) - 16-Jun-2011 13:43:06 - [ 4] 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-6819-SHIFTED 8 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A 12669( 3) - 16-Jun-2011 13:43:06 - [ 5] Visit: 02 Visit Requirements: SAME ORIENT AS 01; AFTER 30-SEP-2012:23:59:59 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-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 10 S POS TARG 40, 40 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG 40, 40; PAR 3 IFTED S ER WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 466 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG 60, 80 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 670 S POS TARG 80, 60; PAR 6 IFTED S ER WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 490 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 606 S POS TARG 100, 100; PAR 8 IFTED S ER WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 480 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 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-6819-SHIFTED 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 2 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 3 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 5 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 6 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 12669( 3) - 16-Jun-2011 13:43:06 - [ 6] 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-6819-SHIFTED 8 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A 12669( 3) - 16-Jun-2011 13:43:06 - [ 7] Visit: 03 Visit Requirements: SAME ORIENT AS 01; AFTER 30-SEP-2012:23:59:59 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-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 10 S POS TARG 40, -120 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG 40, -120; PAR 3 IFTED S ER WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 466 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG 60, -80 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 670 S POS TARG 80, -100; PAR 6 IFTED S ER WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 490 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 606 S POS TARG 100, -60; PAR 8 IFTED S ER WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 480 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 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-6819-SHIFTED 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 2 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 3 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 5 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 6 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 12669( 3) - 16-Jun-2011 13:43:06 - [ 8] 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-6819-SHIFTED 8 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A 12669( 3) - 16-Jun-2011 13:43:06 - [ 9] Visit: 04 Visit Requirements: SAME ORIENT AS 01; AFTER 30-SEP-2012:23:59:59 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-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 10 S POS TARG -120, 40 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG -120, 40; PAR 3 IFTED S ER WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 466 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 600 S POS TARG -100, 80 IFTED S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 670 S POS TARG -80, 60; PAR 6 IFTED S ER WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 490 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6819-SH WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 606 S POS TARG -60, 100; PAR 8 IFTED S ER WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6819-SH ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO, GAIN=2.0 1 480 S IFTED ------------------------------------------------------------------------------------------------------------------------------------ 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-6819-SHIFTED 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 2 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 3 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 5 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-6819-SHIFTED 6 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-6819-SHIFTED 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 12669( 3) - 16-Jun-2011 13:43:06 - [ 10] 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-6819-SHIFTED 8 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A 12669( 3) - 16-Jun-2011 13:43:06 - [ 11] Summary Form for Proposal 12669 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, GAIN=2.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 30-SEP-2012:23:59:59, ORIENT 79D TO 81 D, PAR 3 WITH 2, PAR 6 WITH 5, PAR 8 WITH 7, POS TARG -100, -80, POS TARG -100, 80, POS TARG -120, -120, POS TARG -120, 40, POS TARG -60, -60, POS TARG -60, 100, POS TARG -80, -100, POS TARG -80, 60, POS TARG 100, -60, POS TARG 100, 100, POS TARG 40, -120, POS TARG 40, 40, POS TARG 60, -80, POS TARG 60, 80, POS TARG 80, -100, POS TARG 80, 60, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-6819-SHIFTED ------------------------------------------------------------------------------------------------------------------------------------