Parallax and Component Masses of Wolf 1062 (Gl 748) from HST Fine Guidance Sensor Interferometry

Details Parallax and Component Masses of Wolf 1062 (Gl 748) from HST Fine Guidance Sensor Interferometry Parallax and Component Masses of Wolf 1062 (Gl 748) from HST Fine Guidance Sensor Interferometry

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.1002b&link_type=abstract

American Astronomical Society, DDA meeting #31, #10.02

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present two independent analyses of astrometric data from FGS 3, a white-light interferometer on HST. Both analyses result in parallax, proper motion and component masses for Wolf 1062 AB (component A, M3.5 V). 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 component masses with a precision better than 5%. In one approach we determine the relative weighting required to yield parallax and proper motion for a center of gravity for Wolf 1062 AB. This parallax, along with the period and semi-major axis previously derived from the fringe scanning observations by Franz et al. (1998, AJ, 116, 1432), provides a total mass. Individual masses come from the component weighting. The second approach involves solving simultaneously for reference frame orientation, scale, and the parallax, proper motion, and binary orbital parameters of Wolf 1062 AB. Finally, we compare radial velocities measured at McDonald Observatory with those predicted from the Franz et al (1998) and our simultaneous solution orbits. The comparison provides an independent check on the parallax.

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