GJ 2069A, a new M dwarf eclipsing binary

Details GJ 2069A, a new M dwarf eclipsing binary GJ 2069A, a new M dwarf eclipsing binary

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341l..63d&link_type=abstract

Astronomy and Astrophysics, v.341, p.L63-L66 (1999)

Astronomy and Astrophysics

Astrophysics

56

Stars: Binaries: Eclipsing, Stars: Binaries: General, Stars: Binaries: Spectroscopic, Stars: Binaries: Visual, Stars: Low-Mass, Brown Dwarfs

Scientific paper

We have discovered a third detached M dwarf eclipsing binary system, for which we present an accurate radial velocity orbit and a preliminary light curve. From those data, we derive individual masses (0.433 and 0.397 M_&sun;) with 0.4% accuracy, the most accurate to date for M dwarfs. Both stars are clearly sub-luminous for their mass, compared with solar metallicity stellar models or empirical mass-luminosity relations. Their spectral types are also later than expected. This indicates a metal-rich composition ([M/H] ~ 0.5). An infrared light curve and a more accurate trigonometric parallax would make this system a stringent test of our understanding of M dwarfs. Based on observations obtained at the Observatoire de Haute Provence (CNRS) and at the European Southern Observatory

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