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Map-based trigonometric parallaxes of open clusters. II - The Hyades: 51 TauriThe trigonometric parallax, mass, and mass ratio of 51 Tauri, a binary member of the Hyades star cluster, are determined. The parallax solution, 19.4 mas with a standard error of 1.1 mas, is slightly greater than its generally accepted value and yields a cluster distance of 4.30 +/-2.0 pc or a distance modulus equivalent of 3.16 +/- 0.10 mag, in excellent agreement with recent photographic parallax results. The weighted mean of all trigonometric parallax determinations of the cluster is now 22.9 +/-0.6 mas or a modulus of 3.20 +/- 0.06 mag. The total mass of the 51 Tauri system was found to be 2.56 +/- 0.44 solar masses. Adopting a magnitude difference in line with the spectral types of the components yields individual masses of 1.61 +/- 0.28 and 0.95 +/- 0.18 solar masses. This result places the mass of both the A8 V primary and the G0 secondary stars within the errors of the measurement of the mass-luminosity relation established for solar-neighborhood main-sequence stars.
Document ID
19920061113
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gatewood, George
(NASA Headquarters Washington, DC United States)
Castelaz, Michael
(NASA Headquarters Washington, DC United States)
De Jonge, Joost K.
(NASA Headquarters Washington, DC United States)
Persinger, Timothy
(NASA Headquarters Washington, DC United States)
Stein, John
(Allegheny Observatory Pittsburgh, PA, United States)
Stephenson, Bruce
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
June 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 392
Issue: 2 Ju
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
92A43737
Funding Number(s)
CONTRACT_GRANT: NSF AST-86-17642
CONTRACT_GRANT: NAGW-253
Distribution Limits
Public
Copyright
Other

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