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

We report the discovery of the partially eclipsing binary LP 133-373. Nearly identical eclipses along with observed photometric colorsand spectroscopyindicatethatitisapairofchromosphericallyactivedM4 stars ina circular1.6 day orbit.Lightand velocitycurve modelingtoour differential photometryand velocitydatashowthateachstarhas a mass