13427( 9) - 08-Apr-2014 19:51:33 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13427 Version: 9 Check-in Time: 08-Apr-2014 19:51:33 STScI Edit Number: 0 Title A Look Inside a Star: The Evolved Main-Sequence Channel and Hydrogen Depleted Ultracompact Binaries ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Peter Garnavich University of Notre Dame Y CoI: Mr. Colin Littlefield University of Notre Dame N CoI: Prof. Paula Szkody University of Washington N ------------------------------------------------------------------------------------ Abstract The evolutionary paths of ultracompact interacting binaries often lead to helium transfer in AM CVn systems. But an "evolved main-sequence" channel has long been hypothesized to create ultracompact binaries with detectable hydrogen. Recently, a couple of prime candidate binaries have been identified from time-domain sky surveys that appear to have evolved through this unique path. We propose COS FUV observations of CSS120422, the brightest of these candidates, to compare with the elemental abundance predictions of the evolved main-sequence model. This system has an orbital period of only 55 minutes, well below the hydrogen period minimum. The optical spectrum of CSS120422 is clearly depleted in hydrogen relative to helium, but still has two orders of magnitude more hydrogen than AM CVn stars. The CNO abundance ratios that are available only in the UV provide a stringent test of the evolved main-sequence scenario. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe the cataclysmic variable CSS1204 using COS and the G140L grating. Three orbits will be used for the standard grating setting (1105) and three more orbits will observe at the 1280 setting to include the OVI line at 1038 Ang. The two settings will be done in two visits separated by at most a few days. COS data will be taken in TIME-TAG mode to monitor variability. The target is in the GCS2 catalog, so the coordinates are accurate to 0.4 arcsec and in the HST system. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13427( 9) - 08-Apr-2014 19:51:33 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CSS120422 EXT-STAR, DWARF NOVA, RA=11H11M26.8650S +/- 0.25", J2000 V = 18.5 +/- 0.5 Galex FUV 20.0 mag EMISSION LINE STAR, DEC=+57D12'38.49" +/- 0.25" (AB) INTERACTING BINARY Reference Frame: ICRS Comments: Target is a cataclysmic variable that can have outbursts. Ground monitoring will be done before and during HST visits. ------------------------------------------------------------------------------------------------------------------------------------ 2 CSS120422-SA UNIDENTIFIED, BLANK RA-OFF=0.0S, DEC-OFF=-9.8", FROM J2000 V = 18.5 +/- 0.5 FE-TARGET FIELD 1 Comments: This target is a blank piece of sky which is the bright object safe pointing is 9.8 arcseconds away at PA=180 degrees from CSS120422 ------------------------------------------------------------------------------------------------------------------------------------ 13427( 9) - 08-Apr-2014 19:51:33 - [ 3] Visit: 03 Visit Requirements: ORIENT 115D TO 129 D On Hold Comments: Additional Comments: This should be scheduled in evening local time if at all possible to allow flags to be cleared during the work day. 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 CSS120422 COS/NUV ACQ/IMA PSA MIRRORA 1 25 S (25 USE OFFSET V03SAF GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CSS120422 COS/FUV TIME-TA PSA G140L 1105 FLASH=YES, BUFFER-TIME=8200, 1 2754 S USE OFFSET V03SAF G FP-POS=1 (2754 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CSS120422 COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 2000 S SAME POS AS 2; USE G FP-POS=2 (2000 S) OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ 4 CSS120422 COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 700 S SAME POS AS 2; USE G FP-POS=3 see below OFFSET V03SAF (1081 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CSS120422 COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 1000 S SAME POS AS 2; USE G FP-POS=3 (1000 S) OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ 6 CSS120422 COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 2090 S SAME POS AS 2; USE G FP-POS=4 (2090 S) OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ 7 CSS120422 COS/FUV TIME-TA PSA G140L 1280 FLASH=YES, BUFFER-TIME=8200, 1 3205 S USE OFFSET V03SAF G FP-POS=1 (3205 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 CSS120422 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 2000 S SAME POS AS 2; USE G FP-POS=2 (2000 S) OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ 9 CSS120422 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 1081 S SAME POS AS 2; USE G FP-POS=3 (1081 S) OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ 10 CSS120422 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 1000 S SAME POS AS 2; USE G FP-POS=3 (1000 S) OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ 11 CSS120422 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 2090 S SAME POS AS 2; USE G FP-POS=4 (2090 S) OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 13427( 9) - 08-Apr-2014 19:51:33 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CSS120422 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE CSS120422 2 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A G CSS120422 3 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A G CSS120422 4 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 1081.0 S G CSS120422 5 COS/FUV TIME-TA PSA G140L 1105 none none none none 3 N/A G CSS120422 6 COS/FUV TIME-TA PSA G140L 1105 none none none none 3 N/A G CSS120422 7 COS/FUV TIME-TA PSA G140L 1280 none none none none 4 N/A G CSS120422 8 COS/FUV TIME-TA PSA G140L 1280 none none none none 5 N/A G CSS120422 9 COS/FUV TIME-TA PSA G140L 1280 none none none none 5 N/A G CSS120422 10 COS/FUV TIME-TA PSA G140L 1280 none none none none 6 N/A G CSS120422 11 COS/FUV TIME-TA PSA G140L 1280 none none none none 6 N/A G 13427( 9) - 08-Apr-2014 19:51:33 - [ 5] Visit: B3 Visit Requirements: ORIENT 115D TO 129 D On Hold Comments: Additional Comments: This visit is for BOP checking the safe target only and should not execute onboard HST 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 CSS120422-S COS/NUV ACQ/IMA PSA MIRRORA 1 25 S (25 AFE-TARGET GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CSS120422-S COS/FUV TIME-TA PSA G140L 1105 FLASH=YES, BUFFER-TIME=8200, 1 2754 S AFE-TARGET G FP-POS=1 (2754 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CSS120422-S COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 2000 S SAME POS AS 2 AFE-TARGET G FP-POS=2 (2000 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 CSS120422-S COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 700 S SAME POS AS 2 AFE-TARGET G FP-POS=3 see below (1081 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CSS120422-S COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 1000 S SAME POS AS 2 AFE-TARGET G FP-POS=3 (1000 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CSS120422-S COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=8200, FLASH=YES, 1 2090 S SAME POS AS 2 AFE-TARGET G FP-POS=4 (2090 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 CSS120422-S COS/FUV TIME-TA PSA G140L 1280 FLASH=YES, BUFFER-TIME=8200, 1 3205 S AFE-TARGET G FP-POS=1 (3205 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 CSS120422-S COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 2000 S SAME POS AS 2 AFE-TARGET G FP-POS=2 (2000 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 CSS120422-S COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 1081 S SAME POS AS 2 AFE-TARGET G FP-POS=3 (1081 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 CSS120422-S COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 1000 S SAME POS AS 2 AFE-TARGET G FP-POS=3 (1000 S) ------------------------------------------------------------------------------------------------------------------------------------ 11 CSS120422-S COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=8200, FLASH=YES, 1 2090 S SAME POS AS 2 AFE-TARGET G FP-POS=4 (2090 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CSS120422-SAFE-TARG 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A ET GE 13427( 9) - 08-Apr-2014 19:51:33 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CSS120422-SAFE-TARG 2 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A ET G CSS120422-SAFE-TARG 3 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A ET G CSS120422-SAFE-TARG 4 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 1081.0 S ET G CSS120422-SAFE-TARG 5 COS/FUV TIME-TA PSA G140L 1105 none none none none 3 N/A ET G CSS120422-SAFE-TARG 6 COS/FUV TIME-TA PSA G140L 1105 none none none none 3 N/A ET G CSS120422-SAFE-TARG 7 COS/FUV TIME-TA PSA G140L 1280 none none none none 4 N/A ET G CSS120422-SAFE-TARG 8 COS/FUV TIME-TA PSA G140L 1280 none none none none 5 N/A ET G CSS120422-SAFE-TARG 9 COS/FUV TIME-TA PSA G140L 1280 none none none none 5 N/A ET G CSS120422-SAFE-TARG 10 COS/FUV TIME-TA PSA G140L 1280 none none none none 6 N/A ET G CSS120422-SAFE-TARG 11 COS/FUV TIME-TA PSA G140L 1280 none none none none 6 N/A ET G 13427( 9) - 08-Apr-2014 19:51:33 - [ 7] Visit: T3 Visit Requirements: ORIENT 115D TO 129 D On Hold Comments: Additional Comments: This visit allocates and sets up the safe position offset slot for visit 03 which will use that slot. This S/C visit should go earlier than visit 03 by at least 3 days. This S/C visit will contain only 1 exposure and should be scheduled during the work week if possible. 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 CSS120422 S/C DATA V1 1 5 S (5 S) POS TARG 232.723, -237.515; SAVE OFFSET V03SAF; SPEC COM INSTR ECSLOTSET; QESIPARM ANGLE 180; QESIPARM DIST 9.8 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CSS120422 1 S/C DATA V1 none none none none 1 N/A 13427( 9) - 08-Apr-2014 19:51:33 - [ 8] Summary Form for Proposal 13427 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA, V1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, S/C ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, DATA, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=8200, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 115D TO 129 D, POS TARG 232.723, -237.515, QESIPARM ANGLE 180, QESIPARM DIST 9.8, SAME POS AS 2, SAVE OFFSET V03SAF, SPEC COM INSTR ECSLOTSET, USE OFFSET V03SAF ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names CSS120422, CSS120422-SAFE-TARGET ------------------------------------------------------------------------------------------------------------------------------------