Advertisement

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

Monthly Notice Single Star Mass Removal Evolutionary Prediction Stellar Evolution Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Castor, J. I. & Van Blerkom, D.,1970, Astrophys. J.,161,485ADSCrossRefGoogle Scholar
  2. Gabriel, M. & Noels,A.,1981,Astron. Astrophys.Lett.,94,L1ADSGoogle Scholar
  3. Noels, A., Conti, P. S., Gabriel, M. & Vreux,J-M.,1980, Astron.Astrophys.,92,242ADSGoogle Scholar
  4. Ntissbaumer, H.,Schmutz, W., Smith, L. J.& Willis,A,J.,1981, Astron.Astrophys.Suppl, in pressGoogle Scholar
  5. Smith,L. F.& Kuhi,L.V.,1981,JILA Report No. 117Google Scholar
  6. Vanbeveren, D. & Doom,C.,1980,Astron. Astrophys.,87,77ADSGoogle Scholar
  7. Willis, A.J.,1981,Mon.Not.R.astr.Soc.,198, in pressGoogle Scholar
  8. Willis, A. J.& Wilson,R.,1978,Mon.Not.R.astr.Soc.,182,559ADSGoogle Scholar

Copyright information

© IAU 1982

Authors and Affiliations

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

Personalised recommendations