AA Dor - An Eclipsing Post Common-Envelope Binary

Details AA Dor - An Eclipsing Post Common-Envelope Binary AA Dor - An Eclipsing Post Common-Envelope Binary

2004-10-28

arxiv.org/abs/astro-ph/0410696v1

Astronomy and Astrophysics

Astrophysics

3 pages, 3 figures, proceedings "Astrophysics in the Far Ultraviolet", Aug 2004, Victoria, Canada

Scientific paper

AA Dor (LB 3459) is an eclipsing, close, single-lined, post common-envelope binary (PCEB) consisting of an sdOB primary star and an unseen secondary with an extraordinary small mass - formally a brown dwarf. The brown dwarf may have been a former planet which survived a common envelope phase and has even gained mass. A recent determination of the components' masses from results of state-of-the-art NLTE spectral analysis and subsequent comparison to evolutionary tracks shows a discrepancy between masses derived from radial-velocity and the eclipse curves. Phase-resolved high-resolution and high-SN spectroscopy was carried out with FUSE in order to investigate on this problem. We present preliminary results of an ongoing NLTE spectral analysis of FUSE spectra of the primary.

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