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The H/He Ratio of WN Stars

Published online by Cambridge University Press:  03 August 2017

Paul A. Crowther ,
Linda J. Smith  and
Allan J. Willis
Paul A. Crowther
Affiliation:
Department of Physics and Astronomy University College London Gower St, London WC1E 6BT England
Linda J. Smith
Affiliation:
Department of Physics and Astronomy University College London Gower St, London WC1E 6BT England
Allan J. Willis
Affiliation:
Department of Physics and Astronomy University College London Gower St, London WC1E 6BT England

Abstract

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The observed He II Pickering decrement is modelled using the escape probability method developed by Castor & Van Blerkom (1970) to solve simultaneously the equations of radiative and statistical equilibrium for detailed model hydrogen and helium atoms. All important radiative and collisional processes are incorporated in this nLTE model. We confirm values of 0.0 ≤ H/He ≤ 0.5 for WNE stars and 0.0 ≤ H/He ≤ 3.0 for WNL stars with considerable spread in each subtype.

Type
Session II. Atmospheres
Information
Symposium - International Astronomical Union , Volume 143: Wolf–Rayet Stars and Interrelations with other Massive Stars in Galaxies , 1991 , pp. 97
Copyright
Copyright © Kluwer 1991