We propose to use HST-FGS1R to finish calibrating the mass-luminosity relation for stars less massive than 0.5 Msun, with special emphasis on objects near the stellar/substellar border. Our goals are to determine Mv values to 0.05 magnitude and masses to 5%, and thereby build the fundamental database of stellar masses that we will use to test theoretical models as never before. This program uses the combination of HST-FGS3/FGS1R at optical wavelengths, historical infrared speckle data, ground-based parallax work, metallicity studies, and radial velocity monitoring to examine nearby, subarcsecond binary systems. The high precision separation and position angle measurements with HST-FGS3/FGS1R (to 1 mas in the separations) for these faint (V = 10-15) targets simply cannot be equaled by any ground-based technique. As a result of these measurements, we are deriving high quality luminosities and masses for the components in the systems, and characterizing their spectral energy distributions from 0.5 to 2.2 microns. One of the objects, GJ 1245 C with mass 0.074 +/- 0.002 Msun, is the only object known with an accurate dynamical mass less than 0.10 Msun. The payoff of this proposal is high because the six systems selected for final observations in Cycles 15 and 16 have already been resolved during Cycles 5-13 with HST FGS3/FGS1R and contain most of the reddest objects for which accurate dynamical masses can be determined.

We will use FGS1r in Transfer mode to resolve the target binary systems, thereby obtaining the system separation and position of each binary. We will also observe the binary and nearby field stars in Position mode in order to establish the local inertial reference frame about which the binary components orbit, thereby yielding an absolute rather than just a relative orbit of the components. The F583W broad band filter will be used for all exposures to maximize photometric signal. The Orients and Betweens are selected to (1) place the reference field stars within the FGS FOV, and (2) to execute the observations at times that sample the orbital phase space as well as at times of desired parallax factors. COOL STARS 12 false 0 0 false false false false false SUPPORTED STAR M V-IV . B-V=1.57 J2000 01 10 22.8971 -67 26 41.84 J2000 STAR M V-IV B-V=1.6 J2000 12 28 57.5855 +08 25 31.86 J2000 STAR M V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. B-V=1.84 J2000 12 33 17.5000 +09 01 14.10 J2000 STAR M V-IV B-V=1.6 J2000 05 33 19.1000 +44 49 0.00 J2000 STAR M V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. B-V=1.54 J2000 06 54 4.2353 +60 52 18.35 J2000 STAR M V-IV B-V=1.5 J2000 07 03 55.7400 +52 42 6.70 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 STAR M V-IV This is LHS224AB, but with a false magnitude specification that will facilitate acquisition in Position Mode. J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC J2000 00 00 0.0000 +00 00 0.00 J2000 FGS POS No F583W FGS TRANS No F583W FGS POS No F583W FGS TRANS No F583W FGS TRANS No F583W FGS POS No F583W FGS TRANS No F583W FGS POS No F583W FGS TRANS No F583W FGS POS No F583W FGS TRANS No F583W 1199423457000 75.0 (Tic-Visit :proposal-id 11299 :visit-id "01" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 13:24:20.0" :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 11299 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11299 :visit-id "01" :orbit-number 1 :pcs-time 269 :si-vis-utilization 2949 :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 3281 :pcs-gap 0 ) true 1 0 1196090017000 296.0 (Tic-Visit :proposal-id 11299 :visit-id "02" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 13:24:22.0" :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 11299 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11299 :visit-id "02" :orbit-number 1 :pcs-time 269 :si-vis-utilization 2758 :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 3132 :pcs-gap 0 ) true 1 0 1201890284000 284.5817650697089 (Tic-Visit :proposal-id 11299 :visit-id "03" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 13:24:22.0" :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 11299 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11299 :visit-id "03" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2760 :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 3132 :pcs-gap 0 ) true 1 0 1222828089000 262.17959095990557 (Tic-Visit :proposal-id 11299 :visit-id "04" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 13:24:24.0" :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 11299 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11299 :visit-id "04" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2813 :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 3169 :pcs-gap 0 ) true 1 0 1189470602000 285.0 (Tic-Visit :proposal-id 11299 :visit-id "05" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 13:24:01.0" :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 11299 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11299 :visit-id "05" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2881 :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 3243 :pcs-gap 0 ) true 1 0 1210042034000 74.0 (Tic-Visit :proposal-id 11299 :visit-id "06" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 13:24:26.0" :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 11299 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11299 :visit-id "06" :orbit-number 1 :pcs-time 269 :si-vis-utilization 2920 :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 3200 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 11299 :visit-id "54" :proposal-version -1 :trans-version "20080807" :date "07-Oct-2008 13:50:21.0" :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 11299 :visit-id "54" :obset-id "54" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11299 :visit-id "54" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2813 :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 3169 :pcs-gap 0 ) false 1 0