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The Chemical Composition of the Wolf-Rayet Envelopes

Published online by Cambridge University Press:  19 July 2016

T. Nugis
T. Nugis*
Affiliation:
Tartu Astrophysical Observatory, 202444, Tôravere, Estonia

Abstract

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Model-independent information on the chemical composition of WR stars is obtained from the lines of different ions arising at transitions between highly excited energy levels.

The chemical composition of WR stars strongly differs from the mean cosmic composition. Nuclear processed CNO products of H-burning are revealed in WN envelopes and He-burning products in WC envelopes. The matter enriched with He and N is also present in some ring nebulae around WN stars.

Type
The Giants
Information
Symposium - International Astronomical Union , Volume 145: Evolution of Stars: The Photospheric Abundance Connection , 1991 , pp. 209 - 220
Copyright
Copyright © Kluwer 1991 

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