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Preprint 12f/08

Spectral Analysis of the sdOB Primary of the Post Common-Envelope Binary LB 3459 (AA Dor)

T. Rauch (1), J. Fleig (1), K. Werner (1), J. W. Kruk (2)

(1) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Tübingen, Germany
(2) Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, U.S.A.

To be published in: Proceedings: Future Directions in Ultraviolet Spectroscopy Conference, Annapolis, MD, 2008

Abstract. LB 3459 is an eclipsing, close, post common-envelope binary consisting of a sdOB-type post-EHB primary star (M_1 = 0.45 M_sun) and a low-mass M dwarf secondary star (M₂ = 0.076 M_sun). A NLTE spectral analysis of FUSE observations has shown that the rotation of the primary is bound with 35 ± 10 km/sec. Phosphorus and sulfur are newly identified in the FUSE observations. The abundances are solar and 0.01 times solar, respectively.
 
Key words: Stellar evolution, Stellar atmospheres, Abundances, close binaries

Preprint (151 kb PDF file including figures)

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