On the status of planetary nebulae with WR-type nuclei.
Gorny S.K., Stasinska G.
1995, A&A 303,893
Abstract:
-
A recent systematic search of Wolf-Rayet features in the spectra of Galactic
planetary nebulae has increased the list of objects that are known to have
WR-type nuclei to about 50. We have compared their nebular properties with
those of the other planetary nebulae in the Galaxy. We have found that the
nebular morphological types are similarly distributed in the two groups.
Bipolar nebulae constitute only 20% of the total in each group.
The distribution of the nebular abundance ratios N/O, He/H and C/O are the
same in the two groups. The 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, contrarily to what has been suggested in some former
studies.
PostScript version of the paper is accessible via anonymous ftp:
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