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On the inclination and binarity of the pulsating pre-white dwarf PG 2131 +066 *
Ernst Paunzen 1,
Michael König 2 and
Stefan Dreizler 2
Received 29 July 1997 / Accepted 27 October 1997
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 H emission features, the estimated low inclination and the found 3.9 h 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
* Based on observations obtained at the German-Spanish Astronomical Center, Calar Alto, operated by the Max Planck Institut für Astronomie Heidelberg jointly with the Spanish National Commission for Astronomy.
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© European Southern Observatory (ESO) 1998
Online publication: February 4, 1998