In this resubmission, we have made minor changes to the ORIENT requirements, based on measurements of the most recent frames of the two targets. We also modified the BETWEEN requirement for Target 2 to increase the scheduling opportunities, and updated the coordinates to the GSC-II system. ----- Submission 1 (Tue May 09 19:03:54 GMT 2006) ----- Phase II Proposal 10914 (10914) successfully submitted. ----- Submission 2 (Wed Jun 14 21:41:55 GMT 2006) ----- 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 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 /klingsor/data1/bond/hstcycle15/visbin/OP-cache/10914-v01.xml 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 10914 :visit-id "01" :proposal-version -1 :trans-version "20060322" :date "14-Jun-2006 17:15:09.0" :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 448160 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10914 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10914 :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 ) true 1 0 /var/tmp/OPVisit12687.xml /klingsor/data1/bond/hstcycle15/visbin/OP-cache/10914-v02.xml ORIENT requirement is done so that companion star will not lie near diffraction spikes of primary star. (Tic-Visit :proposal-id 10914 :visit-id "02" :proposal-version -1 :trans-version "20060322" :date "14-Jun-2006 17:36:25.0" :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 10914 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10914 :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 ) true 1 0 /var/tmp/OPVisit12688.xml Here we take one extra exposure to use up the orbit Here we take one extra exposure to use up the orbit