Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.0616a&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #06.16; Bulletin of the American Astronomical Society, Vol. 33, p.1312
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the visual orbit of the Hyades spectroscopic binary θ 2 Tauri from observations with the Mark III Optical Interferometer and the Navy Prototype Optical Interferometer. Combining the visual orbit with the secular parallax from Hipparcos data (de Bruijne et al. 2001, A&A, 367, 111) produces a total mass Σ M of the system of 4.02+0.23-0.20 solar masses. Combining the visual orbit with three recent spectroscopic orbits produces three less-precise and somewhat discordant estimates of Σ M. We use the spectroscopic orbit that best agrees with Σ M from the parallax---Torres, Stefanik, & Latham (1997, ApJ, 485, 167)---to allocate Σ M between the two components. The result is 2.14 and 1.87 solar masses, with uncertainties (for the masses taken individually) of about 0.13 solar masses, somewhat below the masses expected from some recent isochrones. The mass estimates are somewhat correlated, in the sense that accepting a mass at the upper end of the error bar f
Armstrong Thomas J.
Hajian Arsen R.
Mozurkewich Dave
Peterson Deane M.
Thessin Rachel N.
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