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The Small-Péclet-Number Approximation for Radiative Zones and its Application to Shear Layer Instabilities

Published online by Cambridge University Press:  26 May 2016

F. Lignières
F. Lignières*
Affiliation:
Laboratoire d'Astrophysique de Toulouse et Tarbes, UMR CNRS 5572, Observatoire Midi-Pyrénées, 31400 Toulouse, France

Abstract

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Thermal diffusivities within stars are higher by several orders of magnitude than in the earth atmosphere. This particularity of the stellar fluid has subtle effects on the dynamics of stably stratified radiative zones as it contributes to favour some flows and supress others. An asymptotic analysis of hydrodynamic equations for large values of the thermal diffusivity is presented and this results in a simplification of the dynamical effects of the thermal diffusivity. This asymptotic behavior proved to be very useful to understand shear instabilities of Kelvin-Helmholtz type.

Type
Session 3 Rotation, Solar and Stellar Physics
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 346 - 347
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Lignières, F. 1999, A&A 348, 933 Google Scholar
Lignières, F., Califano, F., Mangeney, A. 1999, A&A 349, 1027 Google Scholar
Zahn, J.P. 1974, in Stellar Instabilities and Evolution, IAU Symp. 59, p. 185 CrossRefGoogle Scholar