The Cool Supergiant Population of the Massive Young Star Cluster RSGC1

  title={The Cool Supergiant Population of the Massive Young Star Cluster RSGC1},
  author={Ben Davies and Donald F. Figer and Casey J. Law and Rolf Peter Kudritzki and Francisco Najarro and Artemio Herrero and John W. MacKenty},
  journal={The Astrophysical Journal},
  pages={1016 - 1028}
We present new high-resolution near-IR spectroscopy and OH maser observations to investigate the population of cool luminous stars of the young massive Galactic cluster RSGC1. Using the 2.293 μm CO band-head feature, we make high-precision radial velocity measurements of 16 of the 17 candidate red supergiants (RSGs) identified by Figer et al. We show that F16 and F17 are foreground stars, while we confirm that the rest are indeed physically associated RSGs. We determine that star F15, also… 

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