HST Observations of Astrophysically Important Visual Binaries

0 Assigned ID: 1156 ----- Attempting Submission 1 (Wed Feb 27 19:46:05 GMT 2013) ----- In this re-submission I have added BLADE=A to the short exposures in Visits 02 and 03, now that this optional parameter is available, in order to reduce the effects of shutter jitter on short exposures. --H. E. Bond 9/16/13. 1100139630 ----- Attempting Submission 1 (Sun Jun 23 17:39:36 GMT 2013) ----- ----- Attempting Submission 2 (Mon Jun 24 14:06:03 GMT 2013) ----- ----- Attempting Submission 3 (Mon Jun 24 17:31:19 GMT 2013) ----- ----- Attempting Submission 4 (Mon Sep 16 05:20:42 GMT 2013) ----- the "error" regarding short scan length in visit 04 is to be ignored. EN Target charts were reviewed during previous submissions. HEB HST Observations of Astrophysically Important Visual Binaries We propose to continue our long-term program of astrometry of close visual binaries, with the primary goal of determining purely dynamical masses for 3 important main-sequence stars and 9 white dwarfs (WDs). A secondary aim is to set limits on third bodies in the systems down to planetary mass. Three of our targets are naked-eye stars with much fainter companions that are extremely difficult to image from the ground. Our other 2 targets are double WDs, whose small separations and faintness likewise make them difficult to measure using ground-based techniques. Observations have been completed for a 3rd double WD. The bright stars, to be imaged with WFC3, are: (1) Procyon (P = 40.83 yr), containing a bright F star and a much fainter WD companion. 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 WDs. (2) Sirius (P = 50.14 yr), an A-type star also having a faint WD companion, Sirius B, the nearest and brightest of all WDs. (3) Mu Cas (P = 21.08 yr), a nearby metal-deficient G dwarf for which accurate masses will lead to the stars' helium contents, with cosmological implications. The faint double WDs, to be observed with FGS, are: (1) G 107-70 (P = 18.84 yr), and (2) WD 1818+126 (P = 12.19 yr). Our astrometry of these systems will add 4 accurate masses to the handful of WD masses that are directly known from dynamical measurements. The FGS measurements will also provide precise parallaxes for the systems, a necessary ingredient in the mass determinations. This is the Cycle 21 continuation of a program in which we are determining the orbits of visual binaries. The targets for Cycle 21 are Procyon, mu Cas, Sirius, and WD 1818+126. We have been observing WD 1818+126 with FGS, and this part of the program will continue as before, with 1 orbit of POS mode observations of the target and reference stars made for each of these target fields. Procyon, mu Cas, and Sirius will be observed with WFC3/UVIS. For the two very bright stars, Procyon and Sirius, we will use the long-wavelength F953N filter to reduce the signal. Since even with this filter Procyon A and Sirius A would saturate in the minimum WFC3 exposure, we will let them saturate and use the diffraction spikes to centroid the bright components. For Procyon there will be a series of dithered 38-sec exposures, which will provide good unsaturated exposures for Procyon B at the same telescope pointing. For Sirius there will be a series of 6- and 12-sec dithered exposures. For mu Cas, we will use 1.5-sec exposures in F225W, which will not be saturated. These will be followed at each dither position with a 265-sec exposure, which will be well exposed for the cool dM companion. COOL STARS 12 false true 0.0 0.0 false false false AVAILABLE STAR DA F3-F9 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. ALPHA-CMI HR2943 J2000 J2000 B-V = 0.42 STAR G V-IV Coordinate accuracy confirmed by 2000-01 WFPC2 observations. 6/14/06: updated to ICRS system using galex website. HR321 HD6582 J2000 J2000 B-V = 0.70 STAR A0-A3 V-IV DA Coordinates are for center of mass of the Sirius A-B binary, determined from a WFPC2 observation in January 2008 and a WFC3 observation in September 2012.. ALPHA-CMA HR2491 J2000 J2000 EXT-STAR DC maximum parallax factor occurs Sep 29 and March 29 J2000 J2000 CALIBRATION ASTROMETRIC GSC1018.02189 J2000 J2000 CALIBRATION ASTROMETRIC GSC1018.02278 J2000 J2000 CALIBRATION ASTROMETRIC GSC1018.01251 J2000 J2000 CALIBRATION ASTROMETRIC position and magnitude from GSC2, using Kriss & Stys color transformations. N020230030828 J2000 J2000 CALIBRATION ASTROMETRIC position and magnitude from GSC2, using Kriss & Stys color transformations N020230030566 J2000 J2000 CALIBRATION ASTROMETRIC position and magnitude from GSC2, using Kriss & Stys color transformation N020230031910 J2000 J2000 CALIBRATION ASTROMETRIC position and magnitude from GSC2, color transformation using Kriss & Stys N020230031978 J2000 J2000 WFC3/UVIS Imaging No No F953N WFC3/UVIS Imaging No No F953N WFC3/UVIS Imaging No No F225W FGS POS No F583W FGS POS No F583W POS-TARG DITHER 0.173 LINE 0.112 false true 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1

false

The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 1379308782980 /tmp/OPVisit3863625711388292324.xml ORIENT requirement is done so that companion star will not lie near diffraction spikes or charge bleeding from the very bright primary star. (Tic-Visit :proposal-id 13468 :visit-id "01" :proposal-version -1 :trans-version "20130722" :date "16-Sep-2013 01:19:42.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 146448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13468 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13468 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2834 :al-overhead-at-end 40 :internal-dur-at-end 197 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3187 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 1379307554745 /user/bond/klingsor1/hstcycle21/visbin/OP-cache/13468-v02.xml ORIENT requirement is done so that companion star will not lie near diffraction spikes or charge bleeding of primary star. (Tic-Visit :proposal-id 13468 :visit-id "02" :proposal-version -1 :trans-version "20130722" :date "16-Sep-2013 00:59:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 73232 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13468 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13468 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2995 :al-overhead-at-end 45 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3332 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 1379308588004 /user/bond/klingsor1/hstcycle21/visbin/OP-cache/13468-v03.xml ORIENT requirement is done so that companion star will not lie near diffraction spikes or charge bleeding from the very bright primary star. (Tic-Visit :proposal-id 13468 :visit-id "03" :proposal-version -1 :trans-version "20130722" :date "16-Sep-2013 01:16:25.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 499088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13468 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13468 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2756 :al-overhead-at-end 76 :internal-dur-at-end 582 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 1379308785180 /tmp/OPVisit3093773895850927303.xml 1379662290000 76.0 (Tic-Visit :proposal-id 13468 :visit-id "04" :proposal-version -1 :trans-version "20130722" :date "16-Sep-2013 01:19:44.0" :trans-errors '(:WARNINGS 1 :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 13468 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13468 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2761 :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 3129 :pcs-gap 0 ) true 1 0