Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-12-02
Astronomy and Astrophysics
Astrophysics
13 pages, 7 figures. To appear in AJ March 2001
Scientific paper
10.1086/319399
We present an analysis of astrometric data from FGS 3, a white-light interferometer on {\it HST}, and of radial velocity data from two ground-based campaigns. We model the astrometric and radial velocity measurements simultaneously to obtain parallax, proper motion and component masses for Wolf 1062 = Gl 748 AB (M3.5V). To derive the mass fraction, we relate FGS 3 fringe scanning observations of the science target to a reference frame provided by fringe tracking observations of a surrounding star field. We obtain an absolute parallax $\pi_{abs} = 98.0 \pm 0.4$ milliseconds of arc, yielding ${\cal M}_A = 0.379 \pm 0.005{\cal M}_{\sun}$ and ${\cal M}_B= 0.192 \pm 0.003 {\cal M}_{\sun}$, high quality component masses with errors of only 1.5%.
Benedict George F.
Bradley Arthur J.
Crawford James L.
Duncombe Raynor L.
Franz Otto G.
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