Effects of envelope overshoot on stellar models

Details Effects of envelope overshoot on stellar models Effects of envelope overshoot on stellar models

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244...95a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 1, April 1991, p. 95-106. Research supported by Ministero dell'Univer

Mathematics

Logic

116

Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Red Giant Stars, Stellar Evolution, Stellar Models, Globular Clusters, Helium, Hydrogen, Magellanic Clouds, Stellar Luminosity, Stellar Mass

Scientific paper

It is shown that a certain amount of nonlocal overshoot at the base of the outer convective envelope of low mass stars, while climbing along the RG toward central He ignition, can explain the shift of approximately 0.4 mag required to make the luminosity of the bump expected in the theoretical RGB luminosity function agree with the observational data. It is suggested that stellar models should be calculated taking into account both envelope overshoot, calibrated in the domain of glubular clusters, and core overshoot, which in turn is calibrated in the range of young LMC clusters.

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