EDP Sciences
Free access
Volume 402, Number 1, April IV 2003
Page(s) 29 - 35
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20030230

A&A 402, 29-35 (2003)
DOI: 10.1051/0004-6361:20030230

Quantum corrections to microscopic diffusion constants

H. Schlattl and M. Salaris

Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
(Received 21 November 2002 / Accepted 13 February 2003)

We review the state of the art regarding the computation of the resistance coefficients in conditions typical of the stellar plasma, and compare the various results studying their effect on the solar model. We introduce and discuss for the first time in an astrophysical context the effect of quantum corrections to the evaluation of the resistance coefficients, and provide simple yet accurate fitting formulae for their computation. Although the inclusion of quantum corrections only weakly modifies the solar model, their effect is growing with density, and thus might be of relevance in case of denser objects like, e.g., white dwarfs.

Key words: diffusion -- Sun: interior -- stars: evolution -- stars: abundances

Offprint request: H. Schlattl, hs@astro.livjm.ac.uk

© ESO 2003