Institut für Astronomie und Astrophysik

Abteilung Astronomie

Preprint D/98

On the inclination and binarity of the pulsating pre-white dwarf PG 2131+066

Ernst Paunzen(1), Michael König(2), Stefan Dreizler(2)

(1)Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, A-1180 Wien, Austria
(2)Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany

1998, Astronomy & Astrophysics, 331, 162

Abstract. We report on new spectroscopic data as well as recent results from a temporal analysis of PG 2131+066 WET time series, yielding a new interpretation of the binarity nature for PG 2131+066. The newly discovered Halpha emission features, the estimated low inclination and the found 3.9h period, support the picture of a close binary system, composed of the nonradial oscillating white dwarf with a cool red dwarf companion. Since the spin and the orbital period are not yet synchronized and because PG 2131+066 has no X-ray counterpart, we classify it as a progenitor of a cataclysmic variable.

Key words: stars: binaries: close - oscillations - white dwarfs - individual: PG 2131+066

Paper (119k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de) Last updated 13-Jul-1998