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Overshooting above a convection zone

Published online by Cambridge University Press:  12 August 2011

Kwing L. Chan ,
Tao Cai  and
Harinder P. Singh
Kwing L. Chan
Affiliation:
Department of Mathematics, Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong, China email: [email protected]
Tao Cai
Affiliation:
Department of Mathematics, Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong, China email: [email protected]
Harinder P. Singh
Affiliation:
Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India email: [email protected]
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Abstract

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As compressible convection has inherent up/down asymmetry, overshooting above and below a convection zone behave differently. In downward overshooting, the narrow down-flow columns dynamically play an important role. It is customary, and reasonable, to use the downward flux of kinetic energy as a proxy for overshooting. In the upward situation, the flux of kinetic energy can take on different signs near the upper boundary of the convection zone, and its magnitude is generally small. It cannot make a good proxy for overshooting. This paper discusses the results of a set of numerical experiments that investigate the problem of overshooting above a convection zone. Particle tracing and color advection are used to follow the mixing process. The overshoot region above a convection zone is found to contain multiple counter cell layers.

Keywords

starsconvectionovershooting
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 317 - 325
Copyright
Copyright © International Astronomical Union 2011

References

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