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On the Chemical Composition of Wolf-Rayet Stars

Published online by Cambridge University Press:  14 August 2015

T. Nugis
T. Nugis*
Affiliation:
W. Struve Tartu Astrophysical Observatory, Estonian S.S.R., U.S.S.R.

Abstract

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The chemical composition of 5 WR stars in Cygnus are considered by using the quasi-nebular variant of Beals' model. On the basis of the general considerations which follow from this model it was concluded that the C/He ratio for the WC stars appears to be more than 10 times higher than for normal OB stars and the N/He ratio in the case of the WN stars seems also to be somewhat higher than for normal OB stars. From the solution of the equations of statistical equilibrium for the level populations, it was found that in the case of the WC stars C/He≈1 and in the case of the WN stars N/He≈0.05–0.1. For the star HD 192163 (WN6) it was found that He/H≈4.2–7.3 and for the other stars He/H≳10.

Type
Part 5 / Wolf-Rayet Stars
Information
Symposium - International Astronomical Union , Volume 67: Variable Stars and Stellar Evolution , 1975 , pp. 291 - 296
Copyright
Copyright © Reidel 1975 

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