Evidence for convective penetration from a variety of sources is used to deduce a simple model which establishes a relation between the subadiabatic extent of a convective region and the velocity of the penetrating motions. It is found that the subadiabatic penetration at the bottom of a convective envelope is of the order of a pressure scale height, and that above a convective core it amounts to a substantial fraction of the core radius. It is shown that the requirements for nearly adiabatic penetration are met deep enough in a stellar interior and that the departures from adiabaticity are confined to a thin boundary layer. This allows the use of Roxburgh's integral constraint to predict the actual size of a convective core.
CITATION STYLE
Zahn, J.-P. (2008). Convective penetration into stellar radiation zones. In Challenges to Theories of the Structure of Moderate-Mass Stars (pp. 225–232). Springer Berlin Heidelberg. https://doi.org/10.1007/3-540-54420-8_70
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