Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26at....7....1s&link_type=abstract
Astronomical and Astrophysical Transactions (ISSN 1055-6796), vol. 7, no.1, p. 1-27
Astronomy and Astrophysics
Astrophysics
2
Collisional Plasmas, Electric Fields, Gravitational Fields, Light Elements, Magnetic Stars, Magnetostatic Fields, Peculiar Stars, Plasma Dynamics, Radiation Distribution, Stellar Atmospheres, Anisotropy, Atmospheric Boundary Layer, Equations Of Motion, Fokker-Planck Equation, Isotopes, Plasma Acceleration, Plasma Diffusion, Plasma Drift
Scientific paper
Generalized equations of dynamics for plasma components describing the formation of chemical peculiarities in stellar atmospheres due to gravitational, electrostatic, magnetostatic and radiation fields acting on colliding plasma particles have been derived. The equations describing both diffusion and drift phenomena can be treated intercoupled equations of the Fokker-Planck type. It has been shown that in stellar atmospheres there will be generated the electrostatic field which is important for the separation of light elements and their isotopes. A highly anisotropic diffusion in upper atmospheric layers of magnetic stars has been demonstrated. For the interaction of the plasma components with the radiation field, besides a usual upward directed radiation flux generated acceleration, a more complicated light-induced drift due to the selective resonance-like absorption of radiation by thermally moving plasma particles with definite momentum values is shown to be present. The light induced drift can be directed both upwards or downwards and can be a dominant mechanism in the chemical element separation.
Aret A.
Sapar A. A.
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