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American Astronomical Society, Astrophysical Journal, 2(661), p. 1112-1118, 2007

DOI: 10.1086/517872

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LP 133-373: A New Chromospherically Active Eclipsing dMe Binary with a Distant, Cool White Dwarf Companion

Journal article published in 2007 by T. R. Vaccaro, M. Rudkin, A. Kawka ORCID, S. Vennes, T. D. Oswalt, I. Silver, M. Wood, J. Allyn Smith, J. Allyn Smith
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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 day 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 Msolar and 0.33+/-0.02 Rsolar. 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 Msolar, which would make the system at least 3 Gyr old.