[WR] nuclei of planetary nebulae: inferences from statistical studies of the
nebulae.
Gorny S.K., Stasinska G.
1996, Hydrogen-Deficient Stars, Jeffery & Heber (eds.), ASP Conference
Series, Vol. 96, 209
Abstract:
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We have investigated the nebular properties of planetary nebulae known to
have [WR]-type nuclei. We have found that morphological types, chemical
abundances and electron densities are similar to those of the other
planetary nebulae in the Galaxy. The only marked difference is that
nebular expansion velocities are larger in the group of planetary nebulae
with [WR] central stars. We argue that the WR phenomenon does not
preferentially occur in more massive central stars of planetary nebulae.
We demonstrate that, for most of the observed [WR]-type objects, the WR
phenomenon could not be triggered by a final helium shell flash event.
PostScript version of the paper is accessible via anonymous ftp:
gs_BAM.ps.gz
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