10914( 3) - 06/15/06 08:07 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10914 Version: 3 Check-in Time: 15-Jun-2006 12:06:36 STScI Edit Number: Title HST Observations of Astrophysically Important Visual Binaries ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Howard E. Bond Space Telescope Science Institute CoI: Dr. Ronald L. Gilliland Space Telescope Science Institute N CoI: Dr. Terrence M. Girard Yale University N CoI: Dr. Donald H. Gudehus Georgia State University Research N Foundation CoI: Dr. Edmund Nelan Space Telescope Science Institute N CoI: Dr. Gail Schaefer Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract This is a continuation of a project begun in Cycle 7 and continued up through Cycle 14. The program consists of annual FGS or WFPC2 observations of three visual binary stars that will yield fundamental astrophysical results, once their orbits and masses are determined. Our targets are the following: (1) Procyon (P = 40.9 yr), for which our first WFPC2 images yielded an extremely accurate angular separation of the bright F star and its much fainter white-dwarf companion. Combined with ground-based astrometry of the bright star, our observation significantly revised downward the derived masses, and brought Procyon A into much better agreement with theoretical evolutionary masses for the first time. With the continued monitoring proposed here, we will obtain masses to an accuracy of better than 1%, providing a testbed for theories of both Sun-like stars and white dwarfs. (2) G 107-70, a close double white dwarf (P = 18.5 yr) that promises to add two accurate masses to the tiny handful of white-dwarf masses that are directly known from dynamical measurements. (3) Mu Cas (P = 20.8 yr), a famous nearby metal-deficient G dwarf for which accurate masses will lead to the stars' helium contents, with cosmological implications. For all three stars, we will also be setting increasingly stringent limits on the presence of planetary-mass bodies in the systems. ------------------------------------------------------------------------------------ 10914( 3) - 06/15/06 08:07 - [ 2] Observations Description ------------------------ In Cycle 15 we will obtain direct images with WFPC2 of Procyon and Mu Cas. The WFPC2 filters have been chosen appropriately for each target. We will devote one orbit of dithered imaging to each of the two targets. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10914( 3) - 06/15/06 08:07 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PROCYON STAR, F3-F9, DA RA=07H39M18.3700S +/- 1", J2000 V = 0.36+/-0.0 DEC=+05D13'35.50" +/- 1" B-V = 0.42 Reference Frame: ICRS Comments: Coords are for center of gravity of binary. Accuracy confirmed by 2000 Nov 28 WFPC2 observations. 6/14/06: updated to ICRS system using galex website. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1995.18 -0.04755 -1.0229 0.283 2 MU-CAS STAR, G V-IV RA=01H08M16.3700S +/- 0.5", J2000 V = 5.15+/-0.0 DEC=+54D55'13.20" +/- 0.5" B-V = 0.70 Reference Frame: ICRS Comments: Coordinate accuracy confirmed by 2000-01 WFPC2 observations. 6/14/06: updated to ICRS system using galex website. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 0.3972 -1.596 0.134 10914( 3) - 06/15/06 08:07 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 288.0D TO 315.2 D; ORIENT 328.8D TO 45.2 D; BETWEEN 15-OCT- 2006:00:00:00 AND 05-DEC-2006:00:00:00 On Hold Comments: Additional Comments: ORIENT requirement is done so that companion star will not lie near diffraction spikes or bleeding columns from the very bright primary star. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15 1 0.11 S POS TARG 0, 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15,CLOCKS=YES 1 200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15 1 0.11 S POS TARG -0.659,-0.659 ------------------------------------------------------------------------------------------------------------------------------------ 4 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15,CLOCKS=YES 1 200 S SAME POS AS 3 ------------------------------------------------------------------------------------------------------------------------------------ 5 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15 1 0.11 S POS TARG -0.421,-0.375 ------------------------------------------------------------------------------------------------------------------------------------ 6 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15,CLOCKS=YES 1 200 S SAME POS AS 5 ------------------------------------------------------------------------------------------------------------------------------------ 7 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15 1 0.11 S POS TARG -0.318,-0.477 ------------------------------------------------------------------------------------------------------------------------------------ 8 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15,CLOCKS=YES 1 200 S SAME POS AS 7 see below ------------------------------------------------------------------------------------------------------------------------------------ 9 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15 1 0.11 S POS TARG -0.568,-0.273 ------------------------------------------------------------------------------------------------------------------------------------ 10 PROCYON WFPC2 IMAGE PC1 F218W ATD-GAIN=15,CLOCKS=YES 1 160 S SAME POS AS 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 | ------------------------------------------------------------------------------------------------------------------------------------ PROCYON 1 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 2 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 3 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 4 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 5 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 6 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 7 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 8 WFPC2 IMAGE PC1 F218W none none none none 1 160.0 S PROCYON 9 WFPC2 IMAGE PC1 F218W none none none none 1 N/A PROCYON 10 WFPC2 IMAGE PC1 F218W none none none none 1 N/A 10914( 3) - 06/15/06 08:07 - [ 5] Visit: 02 Visit Priority: Visit Requirements: ORIENT 164.0D TO 222.0 D; ORIENT 254.0D TO 312.0 D; ORIENT 344.0D TO 42.0 D; ORIENT 74.0D TO 132.0 D; BETWEEN 25-SEP-2006:00:00:00 AND 01-DEC- 2006:00:00:00 On Hold Comments: Additional Comments: ORIENT requirement is done so that companion star will not lie near diffraction spikes of primary star. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MU-CAS WFPC2 IMAGE PC1 F953N ATD-GAIN=15,CLOCKS=YES 3 1 S POS TARG 0, 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 MU-CAS WFPC2 IMAGE PC1 F953N ATD-GAIN=15,CLOCKS=YES 3 1 S POS TARG -0.659,-0.659 ------------------------------------------------------------------------------------------------------------------------------------ 3 MU-CAS WFPC2 IMAGE PC1 F953N ATD-GAIN=15,CLOCKS=YES 3 1 S POS TARG -0.318,-0.477 ------------------------------------------------------------------------------------------------------------------------------------ 4 MU-CAS WFPC2 IMAGE PC1 F953N ATD-GAIN=15,CLOCKS=YES 4 1 S POS TARG -0.568,-0.273 Comments: Here we take one extra exposure to use up the orbit ------------------------------------------------------------------------------------------------------------------------------------ 5 MU-CAS WFPC2 IMAGE PC1 F953N ATD-GAIN=15,CLOCKS=YES 4 1 S POS TARG -0.421,-0.375 Comments: Here we take one extra exposure to use up the orbit ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU-CAS 1 WFPC2 IMAGE PC1 F953N none none 1 none 1 N/A MU-CAS 1 WFPC2 IMAGE PC1 F953N none none 2 none 1 N/A MU-CAS 1 WFPC2 IMAGE PC1 F953N none none 3 none 1 N/A MU-CAS 2 WFPC2 IMAGE PC1 F953N none none 1 none 1 N/A MU-CAS 2 WFPC2 IMAGE PC1 F953N none none 2 none 1 N/A MU-CAS 2 WFPC2 IMAGE PC1 F953N none none 3 none 1 N/A MU-CAS 3 WFPC2 IMAGE PC1 F953N none none 1 none 1 N/A MU-CAS 3 WFPC2 IMAGE PC1 F953N none none 2 none 1 N/A MU-CAS 3 WFPC2 IMAGE PC1 F953N none none 3 none 1 N/A MU-CAS 4 WFPC2 IMAGE PC1 F953N none none 1 none 1 N/A MU-CAS 4 WFPC2 IMAGE PC1 F953N none none 2 none 1 N/A MU-CAS 4 WFPC2 IMAGE PC1 F953N none none 3 none 1 N/A MU-CAS 4 WFPC2 IMAGE PC1 F953N none none 4 none 1 N/A MU-CAS 5 WFPC2 IMAGE PC1 F953N none none 1 none 1 N/A MU-CAS 5 WFPC2 IMAGE PC1 F953N none none 2 none 1 N/A MU-CAS 5 WFPC2 IMAGE PC1 F953N none none 3 none 1 N/A MU-CAS 5 WFPC2 IMAGE PC1 F953N none none 4 none 1 N/A 10914( 3) - 06/15/06 08:07 - [ 6] Summary Form for Proposal 10914 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ATD-GAIN=15 CLOCKS=YES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 288.0D TO 315.2 D; ORIENT 328.8D TO 45.2 D; BETWEEN 15-OCT-2006 00 00 00 AND 05-DEC-2006 00 00 00; POS TARG 0, 0; SAME POS AS 1; POS TARG -0.659,-0.659; SAME POS AS 3; POS TARG -0.421,-0.375; SAME POS AS 5; POS TARG -0.318,-0.477; SAME POS AS 7; POS TARG -0.568,-0.273; SAME POS AS 9; ORIENT 164.0D TO 222.0 D; ORIENT 254.0D TO 312.0 D; ORIENT 344.0D TO 42.0 D; ORIENT 74.0D TO 132.0 D; BETWEEN 25-SEP-2006 00 00 00 AND 01-DEC-2006 00 00 00; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F218W F953N ------------------------------------------------------------------------------------------------------------------------------------ Target Names PROCYON MU-CAS ------------------------------------------------------------------------------------------------------------------------------------