Diffusion process produced by random internal waves.

Details Diffusion process produced by random internal waves. Diffusion process produced by random internal waves.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jfm...322..355s&link_type=abstract

Journal of Fluid Mechanics, Vol. 322, p. 355 - 382

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31

Stellar Models: Radiative Transfer, Stellar Models: Lithium

Scientific paper

The aim of the paper is to present a new transport process which is likely to have great importance for understanding the internal constitution of the stars. The author gives a short presentation of the physical properties of the Sun and stars, described usually under the names Standard Solar Model or Standard Stellar Models (SSM). Next he shows that an important shortcoming of SSM is that they do not explain the age dependence of the lithium deficiency of stars of known age. The consequence is obviously that one needs to take into account another physical process. Stars having a mass M < 1.3 Msun have a convective zone which begins close to the stellar surface and extends down to a depth which is an appreciable fraction of the stellar radius. In the convective zone, strong stochastic motions carry, at least partially, heat transfer. These motions do not vanish at the lower boundary and generate internal waves into the radiative zone. These random internal waves are at the origin of a diffusion process which can be considered as responsible for the diffusive transport of lithium down to the lithium burning level. This is certainly not the only physical process responsible for lithium deficiency in main sequence stars, but its properties open the way to a completely consistent analysis of lithium deficiency.

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