Diffusion in late stages of stellar evolution.

Details Diffusion in late stages of stellar evolution. Diffusion in late stages of stellar evolution.

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991anpcs..16..481m&link_type=abstract

Ann. Phys. (Paris) Colloq., Vol. 16, No. 4, p. 481 - 495

Physics

1

Stellar Evolution: White Dwarfs, Stellar Evolution: Diffusion

Scientific paper

The abundances of the chemical elements observed at the surface of white dwarfs are the result of diffusion in the external regions of these stars. It is described how diffusion determines the abundances of such elements as carbon, that are now being observed in the far UV. Diffusion is shown to play a minor role in giants but its effects start to appear rapidly after the planetary nebula stage. While the basic the diffusion coefficients involved are uncertain in some cases. They pose interesting statistical physics problems specially for the thermal diffusion coefficients. Depending on the model used it can vary by orders of magnitude. A number of the possible sources of uncertainty of the diffusion coefficients are described as well as the astrophysical context where the coefficients are most uncertain.

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