Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.485...49m&link_type=abstract
In: Proceedings of the First Eddington Workshop on Stellar Structure and Habitable Planet Finding, 11 - 15 June 2001, Córdoba, S
Physics
3
Stars: Structure, Pulsation, Evolution, Nucleosynthesis
Scientific paper
Massive stars are an essential piece of our knowledge of the Universe, since they determine both the spectral and chemical evolution of galaxies. We emphasize that there are many evidences of stellar oscillations in massive stars, not only for β Cephei and SPB stars, but more generally for all OB type stars. These oscillations of short periods (days) are not only observed as fluctuations in the stellar winds, but there are indications of their photospheric origin. This shows the interest of the observation of O- and B-type stars by Eddington. We discuss a number of problems in star formation and evolution of massive stars, which demand a better knowledge of their internal structure, as will be possible with Eddington. Particularly, observations of pre-MS stars may enable us to distinguish between the different existing theories for massive star formation. Also, the better knowledge of the internal μ-gradient and rotation appears as a key information influencing all the outputs of stellar evolution, such as age, tracks in the H-R diagram, populations of blue and red supergiants, populations of WR stars, supernova progenitors and nucleosynthetic yields.
Maeder Andre
Meynet George
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