SDSS121258.25-012310.1: A new eclipsing post common envelope binary

Gomez-Morn A.N.; Schwope, A. D.; Schreiber, M. R.; Gánsicke B.T.

Abstract

From optical photometry we show that SDSS121258.25-012310.1 is a new eclipsing post common envelope binary with an orbital period of ? 8.06 hours and eclipse length of 23 minutes. From spectroscopic follow up observations we measured the semi-amplitude of the radial velocity for the secondary star, K2 181 3 kms-1. By fitting the optical SDSS spectrum we constrained the stellar parameters. The white dwarf temperature is 17700 300 K, its surface gravity log g 7.53 0.2, the spectral type of the secondary star is M4 1 and the distance to the system d 230 20 parsec. Masses are estimated to be in the range 0.25 - 0.38 M? for the red dwarf and 0.33 - 0.48 M? for the white dwarf. We finally discuss the evolutionary state of the system. © 2009 IOP Publishing Ltd.

Más información

Título de la Revista: Journal of Physics: Conference Series
Volumen: 172
Editorial: IOP PUBLISHING LTD
Fecha de publicación: 2009
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-68349139433&partnerID=q2rCbXpz