Two planetary nebulae with tori of different development.

Details Two planetary nebulae with tori of different development. Two planetary nebulae with tori of different development.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...318..561k&link_type=abstract

Astronomy and Astrophysics, v.318, p.561-564

Astronomy and Astrophysics

Astrophysics

1

Planetary Nebulae: General, Planetary Nebulae: Individual: Wei1-5 ([W95] 5, Kewe1

Scientific paper

In this paper we discuss the morphology of two bipolar planetary nebulae (PNe) based on broad-band (ESO/SERC) and narrow-band ([OIII] and Halpha_) 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 Wei1-5 is well explained by a homogeneous torus with a ratio of radius to thickness of 2. KeWe1 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.

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