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LP133-373: A New Chromospherically Active Eclipsing dMe Binary with a Distant, Cool White Dwarf Companion

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arxiv astro-ph/0703061 v1 pith:KU5IRS6J submitted 2007-03-03 astro-ph

LP133-373: A New Chromospherically Active Eclipsing dMe Binary with a Distant, Cool White Dwarf Companion

T.R. Vaccaro , M. Rudkin , A. Kawka , S. Vennes , T.D. Oswalt , I. Silver , M. Wood , J.A. Smith This is my paper
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keywords binaryactivechromosphericallycooldwarfeclipsingmasspair
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We report the discovery of the partially eclipsing binary LP 133-373. Nearly identical eclipses along with observed photometric colors and spectroscopy indicate that it is a pair of chromospherically active dM4 stars in a circular 1.6 d orbit. Light and velocity curve modeling to our differential photometry and velocity data show that each star has a mass and radius of 0.340+/-0.014 M_sun and 0.33+/-0.02 R_sun. The binary is itself part of a common proper motion pair with LP 133-374 a cool DC or possible DA white dwarf with a mass of 0.49-0.82 M_sun, which would make the system at least 3 Gyr old.

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