Convective overshooting in stellar internal models

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Convection, Main Sequence Stars, Stellar Evolution, Stellar Interiors, Stellar Structure, Hertzsprung-Russell Diagram, Stellar Models, Stellar Temperature

Scientific paper

Six upper zero age main sequence (ZAMS) stellar models are calculated explicitly with nonlocal convective treatment. Convective overshooting from the convective core is studied. The overshooting has no sensible influence on the internal structure of ZAMS stars, because the convective energy transport is negligible in the penetrative convective zone. The turbulent fluctuations of velocity and temperature, however, penetrate more deeply into the convective stable layers. The e-folding length is about 1.4 C(1) times the pressure scale. The turbulent kinetic energy flux is less than approximately 1 percent of the total energy flux, and it has no direct influence on the stellar structure.

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