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Inclusion of a time-dependent, non-local convection theory in a stellar evolution code

Published online by Cambridge University Press:  01 August 2006

Achim Weiss  and
Martin Flaskamp
Achim Weiss
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany email: aweiss@mpa-garching.mpg.de
Martin Flaskamp
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany email: aweiss@mpa-garching.mpg.de
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Abstract

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The non-local, time-dependent convection theory of Kuhfuß (1986) in both its one- and three-equation form has been implemented in the Garching stellar evolution code. We present details of the implementation and the difficulties encountered. Specific test cases have been calculated, among them a 5 M⊙ star and the Sun. These cases point out deficits of the theory. In particular, the assumption of an isotropic velocity field leads to too extensive overshooting and has to be modified at convective boundaries. Some encouraging aspects are indicated as well.

Keywords

Convectionmethods: numericalstars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 314 - 316
Copyright
Copyright © International Astronomical Union 2007

References

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