13042( 2) - 03-Jul-2012 14:28:37 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13042 Version: 2 Check-in Time: 03-Jul-2012 14:28:37 STScI Edit Number: 0 Title Confirming the theoretical link between ultra-massive white dwarfs and heavy-weight intermediate mass stars. ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Paul Denholm Dobbie University of Tasmania Y CoI: Dr. Jay B. Holberg University of Arizona Y CoI: Dr. Matthew Burleigh University of Leicester N CoI: Dr. Sarah Casewell University of Leicester N ------------------------------------------------------------------------------------ Abstract We propose to probe the theoretically predicted evolutionary link between ultra-massive O+Ne white dwarfs and stars with M_init~5-10Msolar by using HST and WFC3 to obtain good S/N (~30) imaging to ~25 mag. of 22 sq. arcmins of the young open cluster NGC6705. These observations will allow us to address gaping deficiencies in the current understanding of the late-stage evolution of heavy-weight intermediate mass stars and significantly advance the poor present level of knowledge about their role in the chemical evolution of the Galaxy and other galaxies. ------------------------------------------------------------------------------------ Observations Description ------------------------ These observations will provide deep imaging of the extremely rich young/intermediate age open cluster NGC6705 in the F336W and F555W bands at three discrete WFC3 field pointings. The main goal of this experiment is to identify and characterise faint white dwarf cluster members from their location in the F336W, F555W color-magnitude diagram. NGC6705 is a strongly centrally concentrated open cluster which contains numerous extremely bright sources (V<12). To maximise the number of white dwarfs we detect, which is important for achieving our science goals, we need to point as close to the cluster center as possible but at the same time keep to a minimum the area of CCD that is affected by saturated pixels and overspills. Therefore, we have placed constraints on the ORIENTation of each pointing so as to ensure that the bulk of these brightest stars do not fall within our fields of view. Additionally, we have kept the proposed integration times in the F555W band, where saturation is worst, as short (350s) as still allows for parallel buffer dumps. To sub-sample the WFC3 PSF and to aid in cosmic ray and bad pixel rejection, we employ the default WFC3-UVIS BOX and LINE-3PT dither patterns. Real Time Justification ----------------------- 13042( 2) - 03-Jul-2012 14:28:37 - [ 2] Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13042( 2) - 03-Jul-2012 14:28:37 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC6705-POIN STELLAR CLUSTER, OPEN RA=18H50M51.6832S +/- 0.1", J2000 V = 25.2 U~24.4 TING1 CLUSTER DEC=-06D14'24.49" +/- 0.1" Reference Frame: ICRS Comments: The V (and U) magnitude corresponds to the faintest objects we aim to detect in this field. ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC6705-POIN STELLAR CLUSTER, OPEN RA=18H51M2.9359S +/- 0.1", J2000 V = 25.2 U~24.4 TING2 CLUSTER DEC=-06D19'17.23" +/- 0.1" Reference Frame: ICRS Comments: The V (and U) magnitude corresponds to the faintest objects we aim to detect in this field. ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC6705-POIN STELLAR CLUSTER, OPEN RA=18H51M11.4637S +/- 0.1", J2000 V = 25.2 U~24.4 TING3 CLUSTER DEC=-06D13'37.24" +/- 0.1" Reference Frame: ICRS Comments: The V (and U) magnitude corresponds to the faintest objects we aim to detect in this field. ------------------------------------------------------------------------------------------------------------------------------------ 13042( 2) - 03-Jul-2012 14:28:37 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 5 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13042( 2) - 03-Jul-2012 14:28:37 - [ 5] Visit: 01 Visit Requirements: ORIENT 91D TO 92 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 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W 2 350 S PATTERN 5 1 NTING1 S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F336W FLASH=10.0 1 550 S PATTERN 4 2 NTING1 S ER ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W FLASH=7 1 120 S NTING1 S ER ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F336W FLASH=10.0 1 550 S PATTERN 4 4 NTING1 S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W FLASH=7 1 120 S NTING1 S ER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6705-POINTING1 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 none 1 none 1 N/A S TER NGC6705-POINTING1 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 none 2 none 1 N/A S TER NGC6705-POINTING1 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 none 1 none 1 N/A S TER NGC6705-POINTING1 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 none 2 none 1 N/A S TER NGC6705-POINTING1 1 WFC3/UVI ACCUM UVIS-CEN F555W 3 none 1 none 1 N/A S TER NGC6705-POINTING1 1 WFC3/UVI ACCUM UVIS-CEN F555W 3 none 2 none 1 N/A S TER NGC6705-POINTING1 2 WFC3/UVI ACCUM UVIS-CEN F336W 1 none none none 2 N/A S TER NGC6705-POINTING1 2 WFC3/UVI ACCUM UVIS-CEN F336W 2 none none none 2 N/A S TER NGC6705-POINTING1 2 WFC3/UVI ACCUM UVIS-CEN F336W 3 none none none 2 N/A S TER NGC6705-POINTING1 2 WFC3/UVI ACCUM UVIS-CEN F336W 4 none none none 2 N/A S TER 13042( 2) - 03-Jul-2012 14:28:37 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6705-POINTING1 3 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 2 N/A S TER NGC6705-POINTING1 4 WFC3/UVI ACCUM UVIS-CEN F336W 1 none none none 3 N/A S TER NGC6705-POINTING1 4 WFC3/UVI ACCUM UVIS-CEN F336W 2 none none none 3 N/A S TER NGC6705-POINTING1 4 WFC3/UVI ACCUM UVIS-CEN F336W 3 none none none 3 N/A S TER NGC6705-POINTING1 4 WFC3/UVI ACCUM UVIS-CEN F336W 4 none none none 3 N/A S TER NGC6705-POINTING1 5 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 3 N/A S TER 13042( 2) - 03-Jul-2012 14:28:37 - [ 7] Visit: 02 Visit Requirements: ORIENT 115D TO 120 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 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W 2 350 S PATTERN 5 1 NTING2 S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F336W FLASH=10.0 1 550 S PATTERN 4 2 NTING2 S ER ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W FLASH=7 1 120 S NTING2 S ER ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F336W FLASH=10 1 550 S PATTERN 4 4 NTING2 S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W FLASH=7 1 120 S NTING2 S ER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6705-POINTING2 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 none 1 none 1 N/A S TER NGC6705-POINTING2 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 none 2 none 1 N/A S TER NGC6705-POINTING2 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 none 1 none 1 N/A S TER NGC6705-POINTING2 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 none 2 none 1 N/A S TER NGC6705-POINTING2 1 WFC3/UVI ACCUM UVIS-CEN F555W 3 none 1 none 1 N/A S TER NGC6705-POINTING2 1 WFC3/UVI ACCUM UVIS-CEN F555W 3 none 2 none 1 N/A S TER NGC6705-POINTING2 2 WFC3/UVI ACCUM UVIS-CEN F336W 1 none none none 2 N/A S TER NGC6705-POINTING2 2 WFC3/UVI ACCUM UVIS-CEN F336W 2 none none none 2 N/A S TER NGC6705-POINTING2 2 WFC3/UVI ACCUM UVIS-CEN F336W 3 none none none 2 N/A S TER NGC6705-POINTING2 2 WFC3/UVI ACCUM UVIS-CEN F336W 4 none none none 2 N/A S TER 13042( 2) - 03-Jul-2012 14:28:37 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6705-POINTING2 3 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 2 N/A S TER NGC6705-POINTING2 4 WFC3/UVI ACCUM UVIS-CEN F336W 1 none none none 3 N/A S TER NGC6705-POINTING2 4 WFC3/UVI ACCUM UVIS-CEN F336W 2 none none none 3 N/A S TER NGC6705-POINTING2 4 WFC3/UVI ACCUM UVIS-CEN F336W 3 none none none 3 N/A S TER NGC6705-POINTING2 4 WFC3/UVI ACCUM UVIS-CEN F336W 4 none none none 3 N/A S TER NGC6705-POINTING2 5 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 3 N/A S TER 13042( 2) - 03-Jul-2012 14:28:37 - [ 9] Visit: 03 Visit Requirements: ORIENT 90.0D TO 90.0 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 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W 2 350 S PATTERN 5 1 NTING3 S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F336W FLASH=10 1 550 S PATTERN 4 2 NTING3 S ER ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W FLASH=7 1 120 S NTING3 S ER ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F336W FLASH=10 1 550 S PATTERN 4 4 NTING3 S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC6705-POI WFC3/UVI ACCUM UVIS-CENT F555W FLASH=7 1 120 S NTING3 S ER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6705-POINTING3 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 none 1 none 1 N/A S TER NGC6705-POINTING3 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 none 2 none 1 N/A S TER NGC6705-POINTING3 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 none 1 none 1 N/A S TER NGC6705-POINTING3 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 none 2 none 1 N/A S TER NGC6705-POINTING3 1 WFC3/UVI ACCUM UVIS-CEN F555W 3 none 1 none 1 N/A S TER NGC6705-POINTING3 1 WFC3/UVI ACCUM UVIS-CEN F555W 3 none 2 none 1 N/A S TER NGC6705-POINTING3 2 WFC3/UVI ACCUM UVIS-CEN F336W 1 none none none 2 N/A S TER NGC6705-POINTING3 2 WFC3/UVI ACCUM UVIS-CEN F336W 2 none none none 2 N/A S TER NGC6705-POINTING3 2 WFC3/UVI ACCUM UVIS-CEN F336W 3 none none none 2 N/A S TER NGC6705-POINTING3 2 WFC3/UVI ACCUM UVIS-CEN F336W 4 none none none 2 N/A S TER 13042( 2) - 03-Jul-2012 14:28:37 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6705-POINTING3 3 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 2 N/A S TER NGC6705-POINTING3 4 WFC3/UVI ACCUM UVIS-CEN F336W 1 none none none 3 N/A S TER NGC6705-POINTING3 4 WFC3/UVI ACCUM UVIS-CEN F336W 2 none none none 3 N/A S TER NGC6705-POINTING3 4 WFC3/UVI ACCUM UVIS-CEN F336W 3 none none none 3 N/A S TER NGC6705-POINTING3 4 WFC3/UVI ACCUM UVIS-CEN F336W 4 none none none 3 N/A S TER NGC6705-POINTING3 5 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 3 N/A S TER 13042( 2) - 03-Jul-2012 14:28:37 - [ 11] Summary Form for Proposal 13042 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=10.0, FLASH=7 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 115D TO 120 D, ORIENT 90.0D TO 90.0 D, ORIENT 91D TO 92 D, PATTERN 4 2, PATTERN 4 4, PATTERN 5 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W, F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC6705-POINTING1, NGC6705-POINTING2, NGC6705-POINTING3 ------------------------------------------------------------------------------------------------------------------------------------