Precision Masses of the Low‐Mass Binary System GJ 623 | Zendy

Frantz Martinache | Zendy; James P. Lloyd | Zendy; Michael Ireland | Zendy; Ryan S. Yamada | Zendy; Peter Tuthill | Zendy

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Precision Masses of the Low‐Mass Binary System GJ 623

Author(s) -

Frantz Martinache,

James P. Lloyd,

Michael Ireland,

Ryan S. Yamada,

Peter Tuthill

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/513868

Subject(s) - physics , binary number , astrophysics , telescope , aperture (computer memory) , radial velocity , interferometry , low mass , binary star , astronomy , adaptive optics , binary system , mass ratio , stars , acoustics , mathematics , arithmetic

We have used Aperture Masking Interferometry and Adaptive Optics (AO) at thePalomar 200'' to obtain precise mass measurements of the binary M dwarf GJ 623.AO observations spread over 3 years combined with a decade of radial velocitymeasurements constrain all orbital parameters of the GJ 623 binary systemaccurately enough to critically challenge the models. The dynamical massesmeasured are $m_{1}=0.371\pm0.015 M_{\sun}$ (4%) and $m_{2}=0.115\pm0.0023M_{\sun}$ (2%) for the primary and the secondary respectively. Models are notconsistent with color and mass, requiring very low metallicities.Comment: 7 pages, 5 figures. Accepted for Ap

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