Quantitative spectroscopy of Wolf—Rayet stars in HD 97950 and R136a — the cores of giant H ii regions

@article{Crowther1998QuantitativeSO,
  title={Quantitative spectroscopy of Wolf—Rayet stars in HD 97950 and R136a — the cores of giant H ii regions},
  author={Paul A. Crowther and Luc Dessart},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={1998},
  volume={296},
  pages={622-642}
}
We present quantitative analyses of Wolf–Rayet stars in the cores of two giant H ii regions — HD 97950 in NGC 3603 and R136a in 30 Doradus — based on archive Hubble Space Telescope (HST) spectroscopy. We confirm previous WN6h+abs classifications for components A1, B and C in HD 97950, while classifications for R136a1–3 are revised from O3 If*/WN6 to WN5h. From detailed non-local thermodynamic equilibrium analyses, we find that all Wolf–Rayet stars exhibit products of CNO-processed material at… 
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