Visit 03 has been revised to optimize the ORIENT and BETWEEN for observing G107-70. Care has been taken to avoid having the binary's projected separation along an FGS axis too small for resolving the system, while also assuring that all reference field stars are within the FGS FOV. Moreover, the V magnitude of G107-70 has been stated as V=15.5, even though it is in reality V=14.5. This causes the K1X and K1Y acquisition parameters to be set appropriately to account for the reduced S-curve fringe visbility due to the object's binary nature. Changed orient on visit 3 to 266 ----- Attempting Submission 2 (Mon Sep 17 20:33:39 GMT 2007) ----- ----- Attempting Submission 3 (Tue Sep 18 16:13:28 GMT 2007) ----- Only Visit three has been revised in this proposal. Visit 01 and 02 were not processed through APT for this version of the phase2. HST Observations of Astrophysically Important Visual Binaries 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.
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. 12 false 0.0 false false false false false false SUPPORTED STAR F3-F9 DA 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. B-V = 0.42 ALPHA-CMI HR2943 J2000 00 00 0.0000 +00 00 0.00 J2000 STAR G V-IV Coordinate accuracy confirmed by 2000-01 WFPC2 observations. 6/14/06: updated to ICRS system using galex website. B-V = 0.70 HR321 HD6582 J2000 00 00 0.0000 +00 00 0.00 J2000 STAR DC Double Degenerate binary system B-V = 0.99 GSC3409.01958 J2000 00 00 0.0000 +00 00 0.00 J2000 STAR M V-IV This is a common-proper-motion companion to G107-70 GSC3409.00415 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC GSC3409.01754 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC GSC3409.01706 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC GSC3409.02193 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC GSC3409.02253 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC GSC3409.01670 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC GSC3409.02395 J2000 00 00 0.0000 +00 00 0.00 J2000 ORIENT requirement is done so that companion star will not lie near diffraction spikes or bleeding columns from the very bright primary star. (Tic-Visit :proposal-id 11296 :visit-id "01" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 20:33:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 448160 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11296 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11296 :visit-id "01" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2760 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3132 :pcs-gap 0 ) false 1 0 ORIENT requirement is done so that companion star will not lie near diffraction spikes of primary star. (Tic-Visit :proposal-id 11296 :visit-id "02" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 20:33:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 761872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11296 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11296 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2820 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false 1 0 Here we take one extra exposure to use up the orbit Here we take one extra exposure to use up the orbit (Tic-Visit :proposal-id 11296 :visit-id "03" :proposal-version -1 :trans-version "20070325" :date "17-Sep-2007 16:25:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "05" :si-bright-earth-limb-angle 15.5 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11296 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11296 :visit-id "03" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2823 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3183 :pcs-gap 0 ) false 1 0 /private/tmp/OPVisit56497.xml