Abstract
The treatment of turbulent viscous dissipation is improved in the framework of the non-local mixing-length theory of Maeder. The larger the turbulent viscous dissipation, the thinner is the convective overshooting region. If the length-scale for the turbulent viscous dissipation is assumed to be equal to the pressure scale-height, a 30 M ⊙ model has an overshooting region of moderate extent of about 0.4 H, where H is the pressure scale-height at the classical boundary. With this assumption, the extent of overshooting expressed in units of the pressure scale-height is almost constant but slightly decreases as the evolution proceeds
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