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Red Supergiants in the Andromeda Galaxy (M31)

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arxiv 0907.3767 v1 pith:SUQJNU6B submitted 2009-07-22 astro-ph.GA astro-ph.CO

Red Supergiants in the Andromeda Galaxy (M31)

Philip Massey , David R. Silva , Emily M. Levesque , Bertrand Plez , Knut A. G. Olsen , Geoffrey C. Clayton , Georges Meynet , Andre Maeder This is my paper
classification astro-ph.GA astro-ph.CO
keywords supergiantsevolutiongalaxiesmass-lossmassivemodelsphysicalproperties
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Red supergiants are a short-lived stage in the evolution of moderately massive stars (10-25Mo), and as such their location in the H-R diagram provides an exacting test of stellar evolutionary models. Since massive star evolution is strongly affected by the amount of mass-loss a star suffers, and since the mass-loss rates depend upon metallicity, it is highly desirable to study the physical properties of these stars in galaxies of various metallicities. Here we identify a sample of red supergiants in M31 (the most metal-rich of the Local Group galaxies) and derive their physical properties by fitting MARCS atmosphere models to moderate resolution optical spectroscopy, and from V-K photometry.

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