The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not as Cool as We Thought

  title={The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not as Cool as We Thought},
  author={Emily M. Levesque and Philip Massey and Knut A. G. Olsen and Bertrand Plez and Eric Josselin and Andre Maeder and Georges Meynet},
  journal={The Astrophysical Journal},
  pages={973 - 985}
We use moderate-resolution optical spectrophotometry and the new MARCS stellar atmosphere models to determine the effective temperatures of 74 Galactic red supergiants (RSGs). The stars are mostly members of OB associations or clusters with known distances, allowing a critical comparison with modern stellar evolutionary tracks. We find we can achieve excellent matches between the observations and the reddened model fluxes and molecular transitions, although the atomic lines Ca I λ4226 and Ca II… 

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