Precise Masses for Wolf 1062 AB from Hubble Space Telescope Interferometric Astrometry and McDonald Observatory Radial Velocities

Authors

G. F. Benedict
B. E. McArthur
O. G. Franz
L. H. Wasserman
T. J. Henry
T. Takato
I. V. Strateva
J. L. Crawford
P. A. Ianna
D. W. McCarthy
E. Nelan
W. H. Jefferys
W. van Altena
P. J. Shelus
Paul D. Hemenway, University of Rhode Island
R. L. Duncombe
D. Story
A. L. Whipple
A. J. Bradley
L. W. Frederick

Document Type

Article

Date of Original Version

2001

Abstract

We present an analysis of astrometric data from Fine Guidance Sensor 3 (FGS 3), a white-light interferometer on 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; M3.5 V). 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 (π_abs = 98.0 ± 0.4 mas) yielding M_A = 0.379 ± 0.005 M_⊙ and M_B = 0.192 ± 0.003 M_⊙, high-quality component masses with errors of only 1.5%.

Citation/Publisher Attribution

Benedict, G. F., McArthur, B. E., Franz, O. G., Wasserman, L. H., Henry, T. J., Takato, T., Strateva, I. V.,...Fredrick, L. W. (2001). Precise Masses for Wolf 1062 AB from Hubble Space Telescope Interferometric Astrometry and McDonald Observatory Radial Velocities. The Astronomical Journal, 121, 1607-1613. doi: 10.1086/319399

Available at: http://dx.doi.org/10.1086/319399

Creative Commons License

This work is licensed under a Creative Commons Attribution 3.0 License.

Comment

P. D. Hemenway has a dual appointment with the Graduate School of Oceanography and Department of Physics.