SDSS121258.25-012310.1 : a new eclipsing post common envelope binary
Gomez-Moran, A. Nebot, Schwope, A. D. (Axel D.), Schreiber, Matthias R. and Gänsicke, 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 1742-6596Full text not available from this repository.
Official URL: http://dx.doi.org/10.1088/1742-6596/172/1/012027
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.|
|Official Date:||July 2009|
|Access rights to Published version:||Restricted or Subscription Access|
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