Hostname: page-component-848d4c4894-sjtt6 Total loading time: 0 Render date: 2024-06-27T02:04:38.821Z Has data issue: false hasContentIssue false
  • English
  • Français

On the hydrogen abundance in Wolf-Rayet stars

Published online by Cambridge University Press:  04 August 2017

Werner Schmutz
Werner Schmutz*
Affiliation:
Institute of Astronomy, ETH-Zentrum CH-8092 Zürich, Switzerland

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

With a semiempirical NLTE-model in spherical geometry we investigate the hydrogen abundance in Wolf-Rayet stars. We find that the flux contribution of the H-Balmer to the He-Pickering lines lies between the usually applied approximate formulae for the optically thin and optically thick case. This result can be understood with our finding that there are no optically thin helium and hydrogen lines. The influence of the temperature structure on the relative intensity of the hydrogen-helium blends to the helium lines is vanishingly small, even for peculiar temperature laws. The conclusion is that Wolf-Rayet stars are hydrogen deficient objects.

Type
II. EVOLUTION OF MASSIVE STARS EVOLUTION AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 269 - 272
Copyright
Copyright © Reidel 1984 

References

Castor, J.I.: 1970, Monthly Notices Roy. Astron. Soc. 149, 111.Google Scholar
Castor, J.I. und van Blerkom, D.: 1970, Astrophys. J. 161, 485.Google Scholar
Conti, P.S., Leep, E.M. und Perry, D.N.: 1983 Astrophys. J. 268, 228.Google Scholar
Klein, R.I. und Castor, J.I.: 1978, Astrophys. J. 220, 902.Google Scholar
Massey, P.: 1980, Astrophys. J. 236, 526.CrossRefGoogle Scholar
Sahade, J.: 1981, Rev. Mexicana Astron. Astrof. 6, 189.Google Scholar
Smith, L.J. und Willis, A.J.: 1983, Astron. Astrophys. suppl. , in press.Google Scholar
Underhill, A.B.: 1982, ‘Wolf-Rayet Stars: Observations, Physics, Evolution’, de Loore, W.H. und Willis, A.J. (eds.), IAU Symp. 99, p19.Google Scholar
Underhill, A.B.: 1983, Astrophys. J. 265, 933.Google Scholar