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The C/N Ratio in WN and WC Stars

Published online by Cambridge University Press:  14 August 2015

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

Extract

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We present new determinations of the C/He, N/He and C/N ratios in 6 WN and 4 WC stars, resulting from a Sobolev analysis of new IUE UV line measurements in these species. Through improved observations of more stars, the present work extends an earlier, UV-based, study carried out by Willis & Wilson (1978, WW), which gives details of the Escape Probability Modelling (EPM) utilised. Full details of the current IUE observations, measurements and modelling will appear in Monthly Notices: here we summarise the results. Table 1 lists the ten WR stars currently studied — all were observed at low resolution and the brightest eight at high resolution.

Type
SESSION 2 — THE CHEMISTRY OF THE WOLF-RAYET STARS
Copyright
Copyright © Reidel 1982 

References

Castor, J.I. & Van Blerkom, D., 1970, Astrophys. J. , 161, 485.Google Scholar
Gabriel, M. & Noels, A., 1981, Astron. Astrophys. Lett. , 94, L1.Google Scholar
Noels, A., Conti, P.S., Gabriel, M. & Vreux, J-M., 1980, Astron. Astrophys. , 92, 242.Google Scholar
Nüssbaumer, H., Schmutz, W., Smith, L.J. & Willis, A.J., 1981, Astron. Astrophys. Suppl. , in press.Google Scholar
Smith, L.F. & Kuhi, L.V., 1981, JILA Report No. 117.CrossRefGoogle Scholar
Vanbeveren, D. & Doom, C., 1980, Astron. Astrophys. , 87, 77.Google Scholar
Willis, A.J., 1981, Mon. Not. R. astr. Soc. , 198, in press.Google Scholar
Willis, A.J. & Wilson, R., 1978, Mon. Not. R. astr. Soc. , 182, 559.Google Scholar