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Astron. Astrophys. 327, 721-724


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A search for planetary nebulae around hot white dwarfs*

K. Werner1, K. Bagschik2, T. Rauch1, and R. Napiwotzki3

1Institut für Astronomie und Astrophysik der Universität, Waldhäuser Str. 64, D-72076 Tübingen, Germany
2Sternwarte Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
3Dr. Remeis-Sternwarte, Universität Erlangen-Nürnberg, Sternwartstr. 7, D-96049 Bamberg, Germany

Received 2 June 1997 / Accepted 10 July 1997

Abstract

We have performed a search for old planetary nebulae around hot white dwarfs by direct HFORMULA narrow-band imaging. The 16 examined objects are white dwarfs representing different spectral subtypes, comprising DA and various non-DA stars, among them being PG 1159 stars and white dwarfs exhibiting spectral signatures of ongoing mass-loss by ultra-hot winds.

The search was entirely negative - with one possible exception: PG 0109+111, which is the most massive DO white dwarf known (M = 0.74 MFORMULA) and among the hottest DOs (Teff = 110 000 K). An asymmetric nebulosity extends about 5FORMULAfrom the star to the south-west, and there are hints that it extends even further out. If our detection is in fact the first definite case of a PN around a DO white dwarf it needs to be investigated by detailed spectroscopic observations.

Key words: stars: evolution - stars: AGB and post-AGB - white dwarfs - planetary nebulae: general

* 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

Send offprint requests to: K. Werner


© European Southern Observatory (ESO) 1997

Online publication: October 14, 1997
Last change: April 6, 1998
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