The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 M⊙ stellar mass limit

@article{Crowther2010TheRS,
  title={The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 M⊙ stellar mass limit},
  author={Paul A. Crowther and Olivier Schnurr and Raphael Hirschi and N Yusof and Richard J. Parker and S. P. Goodwin and Hasan Bin Abu Kassim},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2010},
  volume={408},
  pages={731-751}
}
Spectroscopic analyses of hydrogen-rich WN5‐6 stars within the young star clusters NGC 3603 and R136 are presented, using archival Hubble Space Telescope and Very Large Telescope spectroscopy, and high spatial resolution near-IR photometry, including MultiConjugate Adaptive Optics Demonstrator (MAD) imaging of R136. We derive high stellar temperatures for the WN stars in NGC 3603 (T∗ ∼ 42±2 kK) and R136 (T∗ ∼ 53± 3 kK) plus clumping-corrected mass-loss rates of 2 ‐ 5 ×10 −5 M⊙ yr −1 which… 
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