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Astron. Astrophys. 318, 561-564 (1997)

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Two planetary nebulae with tori of different development*

F. Kerber 1 and J.-F. Claeskens 2, 3

1 Institut für Astronomie der Leopold-Franzens-Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
2 Institut d'Astrophysique, 5, Avenue de Cointe, B-4000 Liege, Belgium
3 European Southern Observatory, Casilla 19001, Santiago 19, Chile

Received 29 March 1996 / Accepted 7 June 1996

Abstract

In this paper we discuss the morphology of two bipolar planetary nebulae (PNe) based on broad-band (ESO/SERC) and narrow-band ([O III ] and H [FORMULA]) images. At first sight both objects are similar and show two pronounced bright knots - the usual signature of a torus seen edge-on. We demonstrate though that the two objects are not two of a kind at this point but are rather representing two different stages of evolution. The brightness distribution found in Wei 1-5 is well explained by a homogeneous torus with a ratio of radius to thickness of 2. KeWe 1 is a complicated object showing point symmetry. It can be understood in terms of an incomplete ring, probably a torus caught in the process of breaking up due to the action of a strong wind from the central star.

Key words: planetary nebulae: general – planetary nebulae: individual: Wei 1 – 5, KeWe 1

Send offprint requests to: F. Kerber, florian.kerber@uibk.ac.at
*Based on observations collected at the European Southern Observatory, La Silla, Chile

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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