Free Access
| Issue |
EAS Publications Series
Volume 82, 2019
Astro Fluid: An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements
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|---|---|---|
| Page(s) | 153 - 165 | |
| Section | Seismology and Stellar Structure, Evolution and Rotation | |
| DOI | https://doi.org/10.1051/eas/1982015 | |
| Published online | 21 June 2019 | |
Astro Fluid 2016
A.S. Brun, S. Mathis, C. Charbonnel and B. Dubrulle (eds)
EAS Publications Series, 82 (2019) 153-165
A.S. Brun, S. Mathis, C. Charbonnel and B. Dubrulle (eds)
EAS Publications Series, 82 (2019) 153-165
Core overshooting under the light of fluid dynamics
Université de Toulouse; UPS-OMP; IRAP; Toulouse; France and CNRS; IRAP; 14, avenue Edouard Belin, 31400 Toulouse, France
We discuss the possible contraints that are brought about by a fluid mechanical analysis of the overshooting phenomenon at the interface of convective cores and radiative envelopes of early-type stars. We investigate an improvement of Roxburgh’s criterion by taking into account the viscous dissipation but show that this criterion remains not stringent enough to be predictive. We then discuss the thickness of the overshooting layer and show that all estimates, including the one of Zahn (1991), lead to a very thin mixing layer typically less than a percent of the pressure scale height.
© EAS, EDP Sciences, 2019