Volume 417, Number 2, April II 2004
|Page(s)||647 - 650|
|Section||Interstellar and circumstellar matter|
|Published online||19 March 2004|
On the discovery of an enormous ionized halo around the hot DO white dwarf PG 1034+001
Dr.-Remeis-Sternwarte, Sternwartstraße 7, 96049 Bamberg, Germany
2 Institut für Astronomie und Astrophysik, Abteilung Astronomie, Sand 1, 72076 Tübingen, Germany
3 Space Telescope – European Coordinating Facility, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany
Corresponding author: T. Rauch, Thomas.Rauch@sternwarte.uni-erlangen.de
Accepted: 6 February 2004
The discovery of the largest known planetary nebula on the sky surrounding the DO white dwarf PG 1034+001 with an apparent diameter of about 2°, corresponding to a linear diameter of 3.5–7.0 pc at the likely distance of 100–200 pc, has been reported by Hewett et al. ([CITE]). A careful inspection of available sky survey data has now shown that this planetary nebula, Hewett 1, is surrounded by an elliptical emission shell with an apparent diameter of ° ( at ). A further emission structure, detected northeast of the central star, may indicate another shell with a size of 10° 16°. From presently available observational data we do not have indications revealing whether the emission arises from material ejected from PG 1034+001 or from ionized ambient ISM. Improved proper motion data combined with radial velocity and distance data from the literature have enabled us to derive a Galactic orbit for the central star PG 1034+001. Its thin disk orbit and the morphology of the first halo suggest that the nebula is in an advanced stage of interaction with the interstellar medium.
Key words: ISM: planetary nebulae: individual: PN G080.3-10.4 / ISM: planetary nebulae: general / stars: AGB and post-AGB / stars: individual: PG 1034+001
© ESO, 2004
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