A calibration of mixing length theory based on RHD simulations of solar-type convection

Radiation hydrodynamics (RHD) models provide detailed information about the dynamics, thermal structure, and convective efficiency of the superadiabatic region at the top of solar-type convection zones, and allow an extrapolation of the entropy (s"*) in their deep, adiabatic layers. For the Sun we find a close agreement between s"* inferred from our RHD models and an empirical determination of s"* from helioseismology. In the framework of mixing length theory (MLT), s"* is translated to an effective mixing-length parameter (#alpha#_c) appropriate to construct global stellar models. The calibration based on our present set of 2D RHD models shows a moderate variation of #alpha#_c across the domain of the HRD investigated so far. (orig.)12 refs.SIGLEAvailable from TIB Hannover: RR 7310(96-14) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman