Neutral helium diffusion coefficients in stars.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1978
- DOI:
- 10.1086/156631
- Bibcode:
- 1978ApJ...226..483M
- Keywords:
-
- Atmospheric Diffusion;
- Helium;
- Neutral Gases;
- Stellar Atmospheres;
- A Stars;
- Diffusion Coefficient;
- Solar Corona;
- Thermal Diffusion;
- Astrophysics;
- Atomic Processes:Solar Chromosphere;
- Atomic Processes:Stellar Atmospheres