The C/N Ratio in WN and WC Stars

  • Linda J. Smith
  • Allan J. Willis
Part of the International Astronomical Union/Union Astronomique Internationale book series (IAUS, volume 99)

Abstract

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.

Keywords

Burning Stratification Clarification A1909 

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References

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Copyright information

© IAU 1982

Authors and Affiliations

  • Linda J. Smith
    • 1
  • Allan J. Willis
    • 1
  1. 1.Department of Physics and AstronomyUniversity College LondonLondonEngland

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