Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..155b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 1, Aug. 1991, p. 155-165.
Astronomy and Astrophysics
Astrophysics
33
A Stars, Ambipolar Diffusion, Hydrogen, Magnetic Stars, Stellar Atmospheres, Magnetic Field Configurations, Metallicity, Stellar Composition, Stellar Magnetic Fields
Scientific paper
High signal to noise observations of magnetic stars have allowed the precise determination of magnetic field geometry as well as of spots or rings of chemical abundance anomalies on the surface of several Ap stars. This has led to a surge of new constraints for the diffusion model. The failure of the simple diffusion model, has shown the need for a careful reinvestigation of the various processes competing in the atmosphere of Ap stars leading to the ring or patchy structures observed. It is shown that ambipolar diffusion of hydrogen could be one of the major processes affecting the chemical abundances supported in the atmosphere of Ap stars. It is important when magnetic field suppresses the hydrogen convection zone. Furthermore, its interaction with the large magnetic fields observed, could strongly modify the structure of the atmosphere in the line-forming region.
Babel Jacques
Michaud Georges
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