Diffusion of helium in the sun

Details Diffusion of helium in the sun Diffusion of helium in the sun

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....57..407n&link_type=abstract

Astronomy and Astrophysics, vol. 57, no. 3, May 1977, p. 407-415. Research supported by the National Research Council.

Physics

46

Helium, Molecular Diffusion, Solar Physics, Chemical Composition, Cosmology, Globular Clusters, Stellar Evolution

Scientific paper

The set of diffusion and flow equations developed by Burgers for a multicomponent gas are reduced to a scheme for the evaluation of the relative diffusion of hydrogen and helium in stars. The resulting equations are combined consistently with Paczynski's stellar evolution code to demonstrate small but significant effects in the sun due to the thermal and gravitational settling of helium. The core helium content of a 1 solar-mass star goes up about 0.04 and the surface helium content down by about 0.03 in 4.5 x 10 to the 9th years.

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