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The Treatment of Overshooting in Stellar Modelling: Instantaneous and Diffusive Approach

Published online by Cambridge University Press:  20 June 2007

C.W. Straka ,
Y. Lebreton ,
M.J.P.F.G. Monteiro  and
P. Ventura
P. Ventura*
Affiliation:
INAF – Osservatorio Astronomico di Roma, via Frascati 33, 00040 MontePorzio Catone (RM), Italy
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Abstract

Convective overshoot is a physical mechanism for which no recipe based on first principles is available; hence the necessity of assuming some parametrisations, which undermine the predictive power of the current generation of stellar models. We evidentiate the non local aspects of the convective phenomenon particularly in the proximities of the convective borders, and identify some cases when the use of a diffusive rather than the classic instantaneous approach to describe overshooting is highly recommended.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 26: Stellar Evolution and Seismic Tools for Asteroseismology - Diffusive Processes in Stars and Seismic Analysis , 2007 , pp. 79 - 89
Copyright
© EAS, EDP Sciences, 2007

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