On the surface compositions of magnetic white dwarfs

Details On the surface compositions of magnetic white dwarfs On the surface compositions of magnetic white dwarfs

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253l..29m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 253, Feb. 1, 1982, p. L29-L32. Research supported by the Natural Sci

Astronomy and Astrophysics

Astrophysics

11

Chemical Composition, Magnetic Stars, Stellar Structure, White Dwarf Stars, Atmospheric Diffusion, Helium Hydrogen Atmospheres, Stellar Envelopes, Stellar Magnetic Fields

Scientific paper

Magnetic white dwarfs have mixed spectra of hydrogen and helium much more frequently than nonmagnetic white dwarfs. Many authors have suggested that this is caused by the slowing down of gravitational settling by the magnetic field. This is shown not to be the case. The magnetic field can effectively stop diffusion only at very small optical depths, not in the usual line-forming region. Instead it is suggested that the magnetic field stops the selective wind of hydrogen postulated by Michaud and Fontaine (1979) to explain the near-complete absence of hydrogen from nonmagnetic, non-DA white dwarfs.

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