Stellar evolution. V - Evolutionary models of population I stars with or without overshooting from convective cores

Astronomy and Astrophysics – Astrophysics

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Astronomical Models, Stellar Evolution, Stellar Structure, Convective Flow, G Stars, Hydrogen, Mass Distribution, Nuclear Fusion

Scientific paper

Three sets of evolutionary models from the main sequence to the red-giant branch are computed; one has the usual treatment of convective cores, while the other sets take into account nonlocal effects of convection in stellar cores with two values of the mixing-length ratio. The models cover the range of A- to G-type stars. Effects of changes of the mixing-length ratio in the core on the extension of the zone of overshooting, stellar structure, evolutionary tracks, lifetimes, the isochrones, gap parameters and age and mass determinations are investigated. A comparison of predicted characteristics of the time lines with the observational data of some clusters supports the reality of overshooting for the models computed with a ratio of mixing length to pressure scale height equal to about 0.5 in the stellar cores.

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