Gomez-Moran, A. Nebot, Schwope, A. D. (Axel D.), Schreiber, Matthias R. and Gaensicke, B. T. (Boris T.). (2009) SDSS121258.25-012310.1 : a new eclipsing post common envelope binary. Journal of Physics: Conference Series, Vol.172 (No.1). 012027. ISSN 1742-6596

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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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Eclipsing binaries
Journal or Publication Title:	Journal of Physics: Conference Series
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	1742-6596
Official Date:	July 2009
Volume:	Vol.172
Number:	No.1
Page Range:	012027
Identification Number:	10.1088/1742-6596/172/1/012027
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/40195

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