Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-11
Astronomy and Astrophysics
Astrophysics
Invited review; to appear in Massive Stars as Cosmic Engines, IAU Symp. 250, ed. F. Bresolin, P. A. Crowther, and J. Puls (Cam
Scientific paper
10.1017/S1743921308020383
Red supergiants (RSGs) are an evolved stage in the life of intermediate massive stars (than than 25 solar masses). For many years, their location in the H-R diagram was at variance with the evolutionary models. Using the MARCS stellar atmospheres, 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 (than than 1 percent) 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.
Levesque Emily M.
Massey Philip
Olsen Knut A. G.
Plez Bertrand
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