Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-11
Astronomy and Astrophysics
Astrophysics
6 pages, Proceedings, 15th European Workshop on White Dwarfs
Scientific paper
The archival spectrum of SDSS J212531.92-010745.9 shows not only the typical signature of a PG1159 star, but also indicates the presence of a companion. With time-series photometry of SDSS J212531.92-010745.9 during 10 nights, spread over one month, with the T"ubingen 80cm and the G"ottingen 50cm telescopes, the binary nature of this object has recently been proven. An orbital period of 6.9h could be determined, and the observed light curve fitted with the nightfall program. A comparison of the spectrum of SDSS J212531.92-010745.9 with NLTE models further constrained the light curve solution. We emphasize that this is the first system of this kind which will allow a dynamical mass determination for a PG1159 star.
Nagel Thomas
Schuh Sonja
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