A search for planetary nebulae around hot white dwarfs.

Details A search for planetary nebulae around hot white dwarfs. A search for planetary nebulae around hot white dwarfs.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327..721w&link_type=abstract

Astronomy and Astrophysics, v.327, p.721-724

Astronomy and Astrophysics

Astrophysics

16

Stars: Evolution, Stars: Agb And Post-Agb, White Dwarfs, Planetary Nebulae: General

Scientific paper

We have performed a search for old planetary nebulae around hot white dwarfs by direct Hα 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=0.74Msun_) and among the hottest DOs (T_eff_=110000K). An asymmetric nebulosity extends about 5' from 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.

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