THE WOLF-RAYET CONTENT OF M33

@article{Neugent2011THEWC,
  title={THE WOLF-RAYET CONTENT OF M33},
  author={Kathryn F. Neugent and Philip Massey},
  journal={The Astrophysical Journal},
  year={2011},
  volume={733}
}
Wolf-Rayet (WR) stars are evolved massive stars, and the relative number of WC-type and WN-type WRs should vary with metallicity, providing a sensitive test of stellar evolutionary theory. The observed WC/WN ratio is much higher than that predicted by theory in some galaxies but this could be due to observational incompleteness for WN types, which have weaker lines. Previous studies of M33's WR content show a galactocentric gradient in the relative numbers of WCs and WNs, but only small regions… 

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