Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..710a&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Dec. 1, 1980, p. 710-722.
Astronomy and Astrophysics
Astrophysics
14
Chemical Composition, Electric Fields, Magnetohydrodynamics, White Dwarf Stars, Abundance, B Stars, Hydrogen, Ionized Gases, Stellar Rotation
Scientific paper
The distribution of the electric field and chemical composition inside a star in diffusive equilibrium are derived. Hydrogen floats on the surface of a helium-rich star; a boundary layer of thickness about one pressure scale height produces a smooth transition in the electric field. Electrically driven mass loss does not occur unless the hydrogen content is extremely small. The electric field is dynamically unimportant outside the star, unless the star has a thermally driven wind. Arguments are given that suggest that white stars do not have such winds. It is also shown that if the star has a modest magnetic field, and if it rotates, the exterior electric field is dominated by the quadrupole contribution of the rotating magnetosphere. These results are important for the understanding of the spectra of white dwarf stars.
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