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Institut für Astronomie und Astrophysik

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Preprint 01/04

On the discovery of an enormous ionized halo around the hot DO white dwarf PG 1034+001

T. Rauch (1, 2), F. Kerber (3), E.M. Pauli (1)

(1) Dr.-Remeis-Sternwarte, Sternwartstraße 7, D-96049 Bamberg, Germany
(2) Institut für Astronomie und Astrophysik, Abteilung Astronomie, Sand 1, D-72076 Tübingen, Germany
(3) Space Telescope - European Coordinating Facility, Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany

To be published in: A&A

Abstract. Very recently, the discovery of the largest known planetary nebula on the sky surrounding the DO white dwarf PG1034+001 with an apparent diameter of about 2 degrees, 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. (2003). 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 6 times 9 degrees (16.2 +6.1/-4.5 times 24.3 +9.1/-6.8 pc at d = 155 +58/-43 pc. A further emission structure, detected northeast of the central star may indicate another shell with a size of 10 times 16 degr. From presently available observational data we do not have indications whether the emission arises from material which was ejected from PG1034+001 or from ionized ambient ISM.
Improved proper motion data combined with radial velocity and distance from the literature have enabled us to derive a Galactic orbit for the central star PG1034+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

Preprint (475 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0402036

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