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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint 12/02

The Enigma of AA Dor

T. Rauch (1,2), K. Werner (1)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Sand 1, D-72076 Tübingen, Germany
(2) Dr.-Remeis-Sternwarte, D-96049 Bamberg, Germany

To appear in: Stellar Rotation, Proceedings IAU Symposium No. 215 (2003)

Abstract. AA Dor (LB 3459) is an eclipsing, close binary (P = 0.26d) consisting of a sdOB primary star and an unseen secondary with an extraordinary small mass. The secondary is possibly a former planet which may have survived a common-envelope phase and has even gained mass.
In order to investigate on an existing discrepancy between the components' mass derived from NLTE spectral analysis and subsequent comparison to evolutionary tracks and masses derived from radial-velocity and the eclipse curves, we performed phase-resolved high-resolution and high-SN spectroscopy with the UVES attached to the ESO VLT. From the obtained spectra, we have determined AA Dor's orbital parameters (P = 22601.702 ±0.005 sec, A = 39.19 ±0.05 km/sec, T0 = 2451917.152690) and the rotational velocity (vrot = 47 ±5 km/sec) of the primary.

Key words: -

Paper (81k gzip'ed Postscript including figures)

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