The M dwarf double-lined spectroscopic binary Gliese 268

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Dwarf Stars, Line Spectra, M Stars, Stellar Spectra, Eccentric Orbits, H Alpha Line, Orbital Elements, Stellar Luminosity, Stellar Mass

Scientific paper

High-resolution Digicon observations in the neighborhood of Hα reveal Gliese 268 as a double-lined spectroscopic binary with components of similar brightness. Separate orbital solutions of the primary and secondary velocities yield mutually consistent orbital elements; the authors find an orbital period of 10d.4, a moderately eccentric orbit (e = 0.34), and a mass ratio M1/M2 = 1.20. The primary and secondary minimum masses of 0.191 and 0.159 M_sun;, respectively, must be very close to the actual masses of the primary and secondary, which are both dM5e stars.

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