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Two planetary nebulae with tori of different development*
F. Kerber 1 and
J.-F. Claeskens 2, 3
Received 29 March 1996 / Accepted 7 June 1996
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 ) 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
Online publication: July 8, 1998