Neutral helium diffusion coefficients in stars

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Atmospheric Diffusion, Helium, Neutral Gases, Stellar Atmospheres, A Stars, Diffusion Coefficient, Solar Corona, Thermal Diffusion

Scientific paper

The neutral atom-proton diffusion coefficient is important in the solar corona and in the atmosphere of He-weak and He-rich stars. Through calculations using a realistic potential that reproduces both the inner repulsive core and the longer-range attraction via polarization, the diffusion coefficient for helium is shown to be due mainly to the long-range interaction. Thermal diffusion is calculated and is shown to be negligible. For other elements, the diffusion coefficient due to polarization should be used.

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