The Low-mass Binaries GL 791.2 and GL 623 - Parallaxes and Mass Estimates from HST Fringe-tracking (POS mode) Interferometry

Details The Low-mass Binaries GL 791.2 and GL 623 - Parallaxes and Mass Estimates from HST Fringe-tracking (POS mode) Interferometry The Low-mass Binaries GL 791.2 and GL 623 - Parallaxes and Mass Estimates from HST Fringe-tracking (POS mode) Interferometry

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19310208b&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #102.08; Bulletin of the American Astronomical Society, Vol. 30, p.1403

Astronomy and Astrophysics

Astronomy

Scientific paper

With fifteen epochs of data spanning 1.7y from Fine Guidance Sensor 3 (one of three white-light interferometers on HST) we have obtained a parallax (pi =0farcs1113 +/-0farcs0006 , d=8.96+/- 0.05 pc) and perturbation orbit for Gl791.2A. This distance and an apparent brightness (V=13.06 +/-0.02, Leggett 1992. ApJS, 82, 351) imply M_V= 13.30 for component A. From the recent lower main sequence Mass-Luminosity relationship of Henry et al. (1998, ApJ, in press) M_A=0.16 +/- 0.017 M_&sun;. The perturbation orbit for Gl 791.2A yields a sum of masses M_A + M_B = 0.256 +/- 0.003 M_&sun;, hence for GL 791.2B, M_B = 0.093+/-0.017 M_&sun;, where virtually all the error is from the M-L fit.
Gl 791.2A Perturbation Orbit Parameter Value
alpha &0\farcs0332+/-0\farcs0005 P&1.471+/-0.008 y e&0.534+/-0.021
The FGS 3 fringe-scanning (TRANS) mode provides Delta V = 3.56+/-0.23, allowing us to place Gl 791.2B in a sparsely-populated region of the lower main sequence mass-luminosity relationship, one of the few points defining the lower main sequence mass-luminosity relationship. We discuss a preliminary parallax and perturbation orbit for Gl 623. Observations covering a complete period are required to improve those results. This research had the support of NASA Grants NAS5-1603, GO-06036.01-94A, and GO-07491.01-97A.

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