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We report the discovery of the partially eclipsing binary LP 133-373. Nearlyidentical eclipses along with observed photometric colors and spectroscopyindicate that it is a pair of chromospherically active dM4 stars in a circular1.6 d orbit. Light and velocity curve modeling to our differential photometryand velocity data show that each star has a mass and radius of 0.340+/-0.014M_sun and 0.33+/-0.02 R_sun. The binary is itself part of a common propermotion pair with LP 133-374 a cool DC or possible DA white dwarf with a mass of0.49-0.82 M_sun, which would make the system at least 3 Gyr old.Comment: Accepted for publication in Ap

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