Hydrogen-deficient Central Stars Revisited

Details Hydrogen-deficient Central Stars Revisited Hydrogen-deficient Central Stars Revisited

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..804..153h&link_type=abstract

PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP Conference Pr

Astronomy and Astrophysics

Astronomy

7

Stellar Composition, Element Relative Abundance, Wolf-Rayet Stars, Giant Stars, Abundances, Chemical Composition, Emission-Line Stars, Giant And Subgiant Stars

Scientific paper

Previous spectral analyses of Wolf-Rayet type central stars resulted in different abundance patterns for late- and early [WC] subtypes, which could not be explained in the framework of post-AGB evolutionary scenarios with any form of a late thermal pulse. Presently we re-analyze systematically these stars, using the most recent version of our non-LTE models for expanding atmospheres which now account for line blanketing by the iron-group elements. So far we revisited the early subtypes. Although for some stars the carbon abundances are revised upwards, they are still only between 24 and 40% by mass and thus systematically lower than for late subtypes. This is inconsistent with an evolutionary sequence [WCL] --> [WCE].

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