Abstract

It is shown that most of usually apparently single nitrogen WR stars with ring emission nebulae around them (WN + Neb) are a probable product of the evolution of a massive close binary with initial masses of components exceeding ~20 MO.

Keywords

Helium 

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References

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Copyright information

© IAU 1982

Authors and Affiliations

  • A. Tutukov
    • 1
  1. 1.Astronomical CouncilUSSR Ac. of Sci.USSR

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