Astronomy and Astrophysics, volume 417, 647-650 (2004/4-2)
On the discovery of an enormous ionized halo around the hot DO white dwarf PG 1034+001.
RAUCH T., KERBER F. and PAULI E.-M.
Abstract (from CDS):
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 3.5-7.0pc at the likely distance of 100-200pc, has been reported by Hewett et al. (2003ApJ...599L..37H
). A careful inspection of available sky survey data has now shown that this planetary nebula, Hewett1
, is surrounded by an elliptical emission shell with an apparent diameter of 6°x9° (16.2+6.1–4.5
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°x16°. 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.
ISM: planetary nebulae: individual: PN G080.3-10.4 - ISM: planetary nebulae: general - stars: AGB and post-AGB - stars: individual: PG 1034+001
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