Submitting Campus

Daytona Beach


Physical Sciences

Document Type


Publication/Presentation Date



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 Mand 0:33 ± 0:02 R. 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 0.49Y0.82 M, which would make the system at least 3 Gyr old.

Publication Title

The Astrophysical Journal



IOP Publishing

Grant or Award Name

NSF grants AST-0206115 and AST-0097616

Additional Information

Dr. Oswalt was not affiliated with Embry-Riddle Aeronautical University at the time this paper was published.