The evolution of massive stars

Computer Science

Scientific paper

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Stellar Evolution, Stellar Mass Ejection, Stellar Winds, Supermassive Stars, B Stars, Binary Stars, Hot Stars, Main Sequence Stars, O Stars, Opacity, Roche Limit, Stellar Atmospheres, Stellar Rotation, X Ray Sources

Scientific paper

The paper considers the evolution of stars with solar masses of 15 and 100. The treatment of convection, semi-convection, and the influence of mass loss by stellar winds at different evolutionary phases are analyzed together with the adopted opacities. Evolutionary sequences computed by various groups are compared with observations, and the advanced evolution of a 15 and a 25 solar mass stars from zero age main sequence through iron collapse is discussed. The effect of centrifugal forces on stellar wind mass loss and the effect of rotation on evolutionary models is examined; as a consequence of the outflow of matter, deeper layers show up and when the mass loss rates are large enough layers with changed composition appear on the surface.

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