EDP Sciences
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Volume 417, Number 2, April II 2004
Page(s) 647 - 650
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20035853

A&A 417, 647-650 (2004)
DOI: 10.1051/0004-6361:20035853

Research Note

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

T. Rauch1, 2, F. Kerber3 and E.-M. Pauli1

1  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

(Received 11 December 2003 / 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. (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 $6\degr \times 9$° ( $16.2^{+6.1}_{-4.5} \times 24.3^{+9.1}_{-6.8}~ {\rm pc}$ at $d = 155^{+58}_{-43}~ {\rm pc}$). A further emission structure, detected northeast of the central star, may indicate another shell with a size of 10° $\times$ 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

Offprint request: T. Rauch, Thomas.Rauch@sternwarte.uni-erlangen.de

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