A faint eclipsing binary associated with the galactic thick disk or halo

Astronomy and Astrophysics – Astronomy

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Eclipsing Binary Stars, Galactic Structure, Light Curve, Galactic Evolution, Halos, Late Stars

Scientific paper

Observations of a faint, red, short-period Galactic eclipsing binary discovered during a recent study of RR Lyrae variables in the halo of M 31 are presented. A possible light-curve solution indicates that the components are of similar size, have temperatures of approximately 3700 K and 2800 K, are non-main-sequence objects, and may have undergone mass transfer. A lower limit for the distance to the system is determined, and the resulting displacement above the Galactic plane is sufficient to preclude the binary being a member of the thin disk. The observed frequency of faint short-period eclipsing binaries at intermediate to high Galactic latitudes is investigated. The surface density of eclipsing binaries appears to be relatively constant over a large range of Galactic latitudes. It is suggested that some of the eclipsing binaries discovered in past surveys could be members of the thick disk or halo.

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