11787( 11) - 20-Jul-2010 13:41:18 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11787 Version: 11 Check-in Time: 20-Jul-2010 13:41:18 STScI Edit Number: 9 Title Dynamical Masses and Radii of Four White Dwarf Stars ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Edmund Nelan Space Telescope Science Institute CoI: Mr. Russell Makidon Space Telescope Science Institute N CoI: Dr. Howard E. Bond Space Telescope Science Institute N CoI: Dr. Gail Schaefer Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract This proposal uses the FGS1r in TRANS mode to resolve a pair of double degenerate binary systems (WD1639+153 and WD 1818+26) in order to determine their orbital elements. In addition, the binaries and several nearby field stars are observed by FGS1r in POS mode to establish the local inertial reference frame of each binary, as well as its parallax and proper motion. This will allow for a direct measurement of the distance, which yields the instrinsic luminosity, and when combined with the spectroscopic estimates of the T_eff, the radius of each of the four WD stars. When combined with the orbital elements, this leads to a dynamical mass measurement for each WD, and a four calibration points of the WD mass-radius relation. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use FGS1r in its high angular resolution observing mode (TRANS) to resolve the white dwarf binary systems. Each exposure will be comprised of about 20 scans. The interferograms derived from each scan will be cross-correlated and co-added to yield a high SNR. To further surpress the noise (these targets are near the FGS's faint limiting magnitude), the co-added inteferograms will be carefully smoothed by being represented as a piece-wise smooth segmanted polynomial. These observations will yield the separation and position angle of the binary components, as well as the brightness of each. In addition, the binary and field stars simultaneously in the FGS FOV will be observed in POS mode to accurately determine the relative positions of the stars. This will facilitate the construction of an inertial reference frame for the binary, thereby allowing the relative orbit that will be ultimately determined from the TRANS data to be converted into a physical orbit. This will allow us to determine the relative mass of each white dwarf in the binarty system. In addition, the POS mode data will give the proper motion and parallax of the binary, which will allow us to compute the mass and radius of each white dwarf. Real Time Justification ----------------------- Calibration Justification 11787( 11) - 20-Jul-2010 13:41:18 - [ 2] ------------------------- Additional Comments ------------------- The observations should be scheduled to occur at times of maximum parallax factor to allow us to determine the distance to each of these two white dwarf binary systems. ------------------------------------------------------------------------------------ 11787( 11) - 20-Jul-2010 13:41:18 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WD1639+153 EXT-STAR, DC RA=16H41M36.7000S +/- 0.1", J2000 V = 15.7 +/- 0.1 DEC=+15D12'36.38" +/- 0.1" Reference Frame: Other: HST CYCLE 10 OBSERVATIONS Comments: Maximum parallax factor occurs Feb 27 & Aug 30. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 0.005 -0.736 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1639-REF1 CALIBRATION, RA=16H41M39.6000S +/- 0.1", J2000 V = 10.73 +/- 0.1 ASTROMETRIC DEC=+15D12'1.87" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1639-REF2 CALIBRATION, RA=16H41M54.1000S +/- 0.1", J2000 V = 12.1 +/- 0.1 ASTROMETRIC DEC=+15D11'19.20" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1639-REF3 CALIBRATION, RA=16H41M49.1300S +/- 0.1", J2000 V = 14.69 +/- 0 ASTROMETRIC DEC=+15D11'1.97" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD1639-REF4 CALIBRATION, RA=16H41M22.8200S +/- 0.1", J2000 V = 13.25 +/- 0.1 ASTROMETRIC DEC=+15D11'55.82" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD1639-REF6 CALIBRATION, RA=16H41M22.4500S +/- 0.1", J2000 V = 13.9 +/- 0.1 ASTROMETRIC DEC=+15D14'11.80" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 11787( 11) - 20-Jul-2010 13:41:18 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1639-REF7 CALIBRATION, RA=16H41M25.9400S +/- 0.1", J2000 V = 13.26 +/- 0.1 ASTROMETRIC DEC=+15D15'44.39" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 8 WD1818+126 EXT-STAR, DC RA=18H20M30.8800S +/- 0.1", J2000 V = 16.06 +/- 0.1 DEC=+12D39'17.70" +/- 0.1" Reference Frame: Other: HST CYCLE 10 PROPOSAL Comments: maximum parallax factor occurs Sep 29 and March 29 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 0.007 0.271 0 ------------------------------------------------------------------------------------------------------------------------------------ 9 WD1818-REF1 CALIBRATION, RA=18H20M23.6700S +/- 0.1", J2000 V = 10.92 +/- 0.2 ASTROMETRIC DEC=+12D39'43.80" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 10 WD1818-REF2 CALIBRATION, RA=18H20M26.3600S +/- 0.1", J2000 V = 12.7 +/- 0.2 ASTROMETRIC DEC=+12D39'25.20" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 11 WD1818-REF3 CALIBRATION, RA=18H20M31.9700S +/- 0.1", J2000 V = 12.97 +/- 0.2 ASTROMETRIC DEC=+12D38'48.12" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 12 WD1818-REF4 CALIBRATION, RA=18H20M33.8600S +/- 0.1", J2000 V = 14.23 +/- 0.2 ASTROMETRIC DEC=+12D39'5.56" +/- 0.1" Reference Frame: ICRS Comments: position and magnitude from GSC2, using Kriss & Stys color transformations. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 11787( 11) - 20-Jul-2010 13:41:18 - [ 5] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 13 WD1818-REF5 CALIBRATION, RA=18H20M35.3400S +/- 0.1", J2000 V = 14.49 +/- 0.2 ASTROMETRIC DEC=+12D38'50.74" +/- 0.1" Reference Frame: ICRS Comments: position and magnitude from GSC2, using Kriss & Stys color transformations Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 14 WD1818-REF6 CALIBRATION, RA=18H20M33.6100S +/- 0.1", J2000 V = 14.43 +/- 0.3 ASTROMETRIC DEC=+12D40'16.29" +/- 0.1" Reference Frame: ICRS Comments: position and magnitude from GSC2, using Kriss & Stys color transformation Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 15 WD1818-REF7 CALIBRATION, RA=18H20M29.4800S +/- 0.1", J2000 V = 15.01 +/- 0.2 ASTROMETRIC DEC=+12D40'21.03" +/- 0.1" Reference Frame: ICRS Comments: position and magnitude from GSC2, color transformation using Kriss & Stys Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 11787( 11) - 20-Jul-2010 13:41:18 - [ 6] Visit: 01 Visit Requirements: GYRO MODE 2G; ORIENT 290D TO 290 D; BETWEEN 26-JAN-2009:00:00:00 AND 28-FEB-2009:00:00:00 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 WD1639+153 FGS TRANS 1 F583W STEP-SIZE=0.5, SCANS=27 1 900.0 S POS TARG 0.0, 0.0; GS ACQ SCENARIO BASE1T3; SEQ 1-12 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1639+153 FGS POS 1 F583W 1 25.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1639-REF1 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1639-REF3 FGS POS 1 F583W 1 10.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD1639-REF2 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD1639-REF1 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1639+153 FGS POS 1 F583W 1 25.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 8 WD1639-REF7 FGS POS 1 F583W 1 10.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 9 WD1639-REF6 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 10 WD1639-REF1 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 11 WD1639+153 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 12 WD1639-REF2 FGS POS 1 F583W 1 5.0 S SAME POS AS 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1639+153 1 FGS TRANS 1 F583W none none none none 1 N/A WD1639+153 2 FGS POS 1 F583W none none none none 1 N/A WD1639-REF1 3 FGS POS 1 F583W none none none none 1 N/A WD1639-REF3 4 FGS POS 1 F583W none none none none 1 N/A WD1639-REF2 5 FGS POS 1 F583W none none none none 1 N/A WD1639-REF1 6 FGS POS 1 F583W none none none none 1 N/A WD1639+153 7 FGS POS 1 F583W none none none none 1 N/A WD1639-REF7 8 FGS POS 1 F583W none none none none 1 N/A WD1639-REF6 9 FGS POS 1 F583W none none none none 1 N/A WD1639-REF1 10 FGS POS 1 F583W none none none none 1 N/A 11787( 11) - 20-Jul-2010 13:41:18 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1639+153 11 FGS POS 1 F583W none none none none 1 N/A WD1639-REF2 12 FGS POS 1 F583W none none none none 1 N/A 11787( 11) - 20-Jul-2010 13:41:18 - [ 8] Visit: 02 Visit Requirements: ORIENT 110.D TO 110. D; BETWEEN 28-AUG-2009:00:00:00 AND 30-AUG-2009:00:00:00 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 WD1639+153 FGS TRANS 1 F583W STEP-SIZE=0.5, SCANS=27 1 900.0 S POS TARG 0.0, 0.0; GS ACQ SCENARIO BASE1B3; SEQ 1-12 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1639+153 FGS POS 1 F583W 1 25.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1639-REF1 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1639-REF3 FGS POS 1 F583W 1 10.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD1639-REF2 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD1639-REF1 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1639+153 FGS POS 1 F583W 1 25.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 8 WD1639-REF4 FGS POS 1 F583W 1 10.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 9 WD1639-REF6 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 10 WD1639-REF1 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 11 WD1639+153 FGS POS 1 F583W 1 5.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 12 WD1639-REF2 FGS POS 1 F583W 1 5.0 S SAME POS AS 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1639+153 1 FGS TRANS 1 F583W none none none none 1 N/A WD1639+153 2 FGS POS 1 F583W none none none none 1 N/A WD1639-REF1 3 FGS POS 1 F583W none none none none 1 N/A WD1639-REF3 4 FGS POS 1 F583W none none none none 1 N/A WD1639-REF2 5 FGS POS 1 F583W none none none none 1 N/A WD1639-REF1 6 FGS POS 1 F583W none none none none 1 N/A WD1639+153 7 FGS POS 1 F583W none none none none 1 N/A WD1639-REF4 8 FGS POS 1 F583W none none none none 1 N/A WD1639-REF6 9 FGS POS 1 F583W none none none none 1 N/A WD1639-REF1 10 FGS POS 1 F583W none none none none 1 N/A 11787( 11) - 20-Jul-2010 13:41:18 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1639+153 11 FGS POS 1 F583W none none none none 1 N/A WD1639-REF2 12 FGS POS 1 F583W none none none none 1 N/A 11787( 11) - 20-Jul-2010 13:41:18 - [ 10] Visit: 04 Visit Requirements: ORIENT 93D TO 93 D; BETWEEN 21-SEP-2010:00:00:00 AND 30-SEP-2010:00:00:00 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 WD1818+126 FGS TRANS 1 F583W STEP-SIZE=0.4, SCANS=20 1 830.0 S POS TARG 0.0, 0.0; GS ACQ SCENARIO BASE1B3; SEQ 1-11 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1818+126 FGS POS 1 F583W 1 30.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1818-REF1 FGS POS 1 F583W 1 7.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1818-REF4 FGS POS 1 F583W 1 7.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD1818-REF3 FGS POS 1 F583W 1 7.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD1818-REF2 FGS POS 1 F583W 1 7.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1818+126 FGS POS 1 F583W 1 30.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 8 WD1818-REF6 FGS POS 1 F583W 1 7.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 9 WD1818-REF4 FGS POS 1 F583W 1 7.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 10 WD1818+126 FGS POS 1 F583W 1 30.0 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 11 WD1818-REF1 FGS POS 1 F583W 1 7.0 S SAME POS AS 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1818+126 1 FGS TRANS 1 F583W none none none none 1 N/A WD1818+126 2 FGS POS 1 F583W none none none none 1 N/A WD1818-REF1 3 FGS POS 1 F583W none none none none 1 N/A WD1818-REF4 4 FGS POS 1 F583W none none none none 1 N/A WD1818-REF3 5 FGS POS 1 F583W none none none none 1 N/A WD1818-REF2 6 FGS POS 1 F583W none none none none 1 N/A WD1818+126 7 FGS POS 1 F583W none none none none 1 N/A WD1818-REF6 8 FGS POS 1 F583W none none none none 1 N/A WD1818-REF4 9 FGS POS 1 F583W none none none none 1 N/A WD1818+126 10 FGS POS 1 F583W none none none none 1 N/A WD1818-REF1 11 FGS POS 1 F583W none none none none 1 N/A 11787( 11) - 20-Jul-2010 13:41:18 - [ 11] Summary Form for Proposal 11787 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes POS, TRANS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCANS=20, SCANS=27, STEP-SIZE=0.4, STEP-SIZE=0.5 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 21-SEP-2010:00:00:00 AND 30-SEP-2010:00:00:00, BETWEEN 26-JAN-2009:00:00:00 AND 28-FEB-2009:00:00:00, BETWEEN 28-AUG-2009:00:00:00 AND 30-AUG-2009:00:00:00, GS ACQ SCENARIO BASE1B3, GS ACQ SCENARIO BASE1T3, GYRO MODE 2G, ORIENT 110.D TO 110. D, ORIENT 290D TO 290 D, ORIENT 93D TO 93 D, POS TARG 0.0, 0.0, SAME POS AS 1, SEQ 1-11 NON-INT, SEQ 1-12 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F583W ------------------------------------------------------------------------------------------------------------------------------------ Target Names WD1639+153, WD1639-REF1, WD1639-REF2, WD1639-REF3, WD1639-REF4, WD1639-REF6, WD1639-REF7, WD1818+126, WD1818-REF1, WD1818-REF2, WD1818-REF3, WD1818-REF4, WD1818-REF6 ------------------------------------------------------------------------------------------------------------------------------------