Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-21
Astronomy and Astrophysics
Astrophysics
To appear in "The Biggest, Baddest, Coolest Stars" (ASP Conf proceeding), ed. D. Luttermoser, B. Smith, and R. Stencel
Scientific paper
Red supergiants (RSGs) are an evolved stage in the life of intermediate massive stars (<25Mo). For many years their location in the H-R diagram was at variance with the evolutionary models. Using the MARCS stellar atmosphere models, we have determined new effective temperatures and bolometric luminosities for RSGs in the Milky Way, LMC, and SMC, and our work has resulted in much better agreement with the evolutionary models. We have also found evidence of significant visual extinction due to circumstellar dust. Although in the Milky Way the RSGs contribute only a small fraction (<1%) of the dust to the interstellar medium (ISM), in starburst galaxies or galaxies at large look-back times, we expect that RSGs may be the main dust source. We are in the process of extending this work now to RSGs of higher and lower metallicities using the galaxies M31 and WLM.
Clayton Geoffery C.
Levesque Emily M.
Massey Philip
Olsen Knut A. G.
Plez Bertrand
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