The R136 star cluster dissected with Hubble Space Telescope/STIS – II. Physical properties of the most massive stars in R136

  title={The R136 star cluster dissected with Hubble Space Telescope/STIS – II. Physical properties of the most massive stars in R136},
  author={Joachim M. Bestenlehner and Paul A. Crowther and Saida M. Caballero-Nieves and Fabian R. N. Schneider and Sergio Sim{\'o}n-D{\'i}az and Sarah A. Brands and Alex de Koter and Goetz Graefener and Artemio Herrero and Norbert Langer and Daniel J. Lennon and Jes{\'u}s Ma{\'i}z Apell{\'a}niz and Joachim Puls and Jorick S. Vink},
  journal={Monthly Notices of the Royal Astronomical Society},
We present an optical analysis of 55 members of R136, the central cluster in the Tarantula Nebula of the Large Magellanic Cloud. Our sample was observed with STIS aboard the Hubble Space Telescope, is complete down to about 40 M⊙, and includes seven very massive stars with masses over 100 M⊙. We performed a spectroscopic analysis to derive their physical properties. Using evolutionary models, we find that the initial mass function of massive stars in R136 is suggestive of being top-heavy with… 
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