Massive stars evolution with mass-loss. I - 20-100-solar-mass models

Details Massive stars evolution with mass-loss. I - 20-100-solar-mass models Massive stars evolution with mass-loss. I - 20-100-solar-mass models

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..103c&link_type=abstract

Astronomy and Astrophysics, vol. 63, no. 1-2, Feb. 1978, p. 103-124. National Research Council of Canada

Astronomy and Astrophysics

Astrophysics

288

Chemical Composition, Main Sequence Stars, Nuclear Fusion, Stellar Evolution, Stellar Mass, Stellar Models, Helium, Hydrogen, Plasma Interactions, Stellar Mass Ejection, Wolf-Rayet Stars

Scientific paper

The evolution of stars with initial masses of 20, 30, 40, 60, 80, and 100 solar masses and Population I chemical composition (X = 0.700, Z = 0.02) is calculated, taking into account mass loss due to stellar winds, from the main sequence up to the early stages of central He-burning. This study incorporates mass-loss rates predicted by the theory of Castor et al. (1975) for the early-type phases and a novel way of treating mass-loss rates due to acoustic-energy-flux-driven winds in the later stages, analogous to the work of Fusi-Pecci and Renzini (1975). The results are presented in terms of evolutionary tracks, isochrones, loci of constant mass-loss rates, and loci of constant mass in the H-R diagram. The effects of mass loss on the internal structure of the models as well as on the occurrence of semiconvection are also investigated. A detailed comparison of the theoretical predictions and observational results is made, and possible implications for O, Of, Wolf-Rayet stars, and red supergiants are brought out.

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