Convective penetration in stellar interiors

Details Convective penetration in stellar interiors Convective penetration in stellar interiors

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..179z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 179-188.

Statistics

Computation

207

Convection, Solar Interior, Stellar Interiors, Stellar Structure, Computational Astrophysics, Stellar Evolution, Stellar Physics

Scientific paper

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.

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