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arXiv · 0809.0895

Visual orbit of GJ 164 AB

Frantz Martinache·Barbara Rojas-Ayala·Michael J. Ireland·James P. Lloyd·Peter G. Tuthill
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Abstract

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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Frantz Martinache, Barbara Rojas-Ayala, Michael J. Ireland, James P. Lloyd, Peter G. Tuthill. 2008-09-04. Visual orbit of GJ 164 AB. https://doi.org/10.1088/0004-637x%2F695%2F2%2F1183

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