Calibrating the Mass-Luminosity Relation at the End of the Main Sequence

Visit 01 has been modified to use ORIENT = 220 to gain access to GL54-REF2, which is needed for the parallax measurment. EN ----- Attempting Submission 2 (Wed May 09 17:35:37 GMT 2007) ----- Unused targets and short exposure time warnings can be ignored. Visit 01 has been revised. Calibrating the Mass-Luminosity Relation at the End of the Main Sequence 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 0.0 0 false 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 /private/tmp/OPVisit55679.xml 1178731971409 (Tic-Visit :proposal-id 10929 :visit-id "01" :proposal-version -1 :trans-version "20070325" :date "09-May-2007 13:32:51.0" :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 10929 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10929 :visit-id "01" :orbit-number 1 :pcs-time 269 :si-vis-utilization 3002 :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 (Tic-Visit :proposal-id 10929 :visit-id "02" :proposal-version -1 :trans-version "20060322" :date "23-May-2006 16:02:25.0" :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 10929 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10929 :visit-id "02" :orbit-number 1 :pcs-time 355 :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 ) false 1 0 (Tic-Visit :proposal-id 10929 :visit-id "03" :proposal-version -1 :trans-version "20060322" :date "23-May-2006 16:02:27.0" :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 10929 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10929 :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 ) false 1 0 (Tic-Visit :proposal-id 10929 :visit-id "04" :proposal-version -1 :trans-version "20060619" :date "19-Sep-2006 13:42:25.0" :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 10929 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10929 :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 ) false 1 0 (Tic-Visit :proposal-id 10929 :visit-id "05" :proposal-version -1 :trans-version "20060322" :date "23-May-2006 16:14:06.0" :trans-errors '(:WARNINGS 4 :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 10929 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10929 :visit-id "05" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2851 :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 ) false 1 0 (Tic-Visit :proposal-id 10929 :visit-id "06" :proposal-version -1 :trans-version "20060322" :date "23-May-2006 16:36:07.0" :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 10929 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10929 :visit-id "06" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2837 :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 ) false 1 0