Visual orbit of GJ 164 AB

Details Visual orbit of GJ 164 AB Visual orbit of GJ 164 AB

2008-09-04

arxiv.org/abs/0809.0895v1

Astrophys.J.695:1183-1190,2009

Astronomy and Astrophysics

Astrophysics

9 pages, 8 figures. Submitted to ApJ

Scientific paper

10.1088/0004-637X/695/2/1183

We report seven successful observations of the astrometric binary GJ 164 AB system with aperture masking interferometry. The companion, with a near infrared contrast of 5:1 was detected beyond the formal diffraction limit. Combined with astrometric observations from the literature, these observations fix the parallax of the system, and allow a model-independent mass determination of both components. We find the mass of GJ 164B to be $ 0.086 \pm 0.007 M_{\sun}$. An infrared spectroscopic study of a sample of M-Dwarfs outlines a method for calibrating metallicity of M-Dwarfs. Results from the newly commissionned TripleSpec spectrograph reveal that the GJ 164 system is at least of Solar metallicity. Models are not consistent with color and mass, requiring a very young age to accommodate a secondary too luminous, a scenario ruled out by the kinematics.

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