Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47..389m&link_type=abstract
Astronomy and Astrophysics, vol. 47, no. 3, Mar. 1976, p. 389-400.
Astronomy and Astrophysics
Astrophysics
98
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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