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Abundances of [WC] Central Stars of PN and the Double Dust Chemistry Problem

Published online by Cambridge University Press:  26 May 2016

Orsola De Marco
Orsola De Marco*
Affiliation:
American Museum of Natural History, New York, NY 10024, USA

Abstract

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The chemical abundances of Wolf-Rayet ([WC]) central stars are reviewed. Although the evolutionary connection between cooler (late) and hotter (early) [WC] central stars and PG1159 central stars is now on solid ground, several issues still remain. In particular, hydrogen and oxygen abundances, that could provide a way of discriminating between different evolutionary channels, are affected by large uncertainties. Following the ground-breaking discovery that cool [WC] central stars harbor hot carbon- as well as hot oxygen-rich dust, current theories of their origin have been put in serious doubt. Observations of three cool [WC] central stars are presented here which, while confirming the deficiency of our theoretical understanding, hint at the possibility of alternative scenarios, such as dust-storing disks.

Type
Part IV: Central Stars and their Atmospheres
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 215 - 222
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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