On the influence of mass loss and convective overshooting on the evolution of massive stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Convective Flow, O Stars, Stellar Evolution, Stellar Mass Ejection, Stellar Winds, X Ray Sources, Computerized Simulation, Hydrogen, Main Sequence Stars, Mass Transfer, Neutron Stars, Stellar Mass Accretion, Stellar Models

Scientific paper

The evolution of massive stars losing mass at a rate approximately equal to (alpha times stellar luminosity) (escape velocity times the speed of light) is computed for alpha = 1, 2, 7. It is shown that observed mass-loss rates correspond to alpha of approximately 0.3 and, therefore, mass loss by stellar wind cannot play any significant role in the evolution of normal massive stars. However, for several types of massive (WR, OH/IR, X-ray sources) enhanced mass loss explains their peculiar features. Computations of evolutionary sequences of massive stars with convective overshoot taken into account (as a formal increase in the convective core) show that a significant broadening of the hydrogen-burning band in the H-R diagram may be obtained.

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