On the importance of the decay-induced Lorentz force to the photospheric structure of hot magnetic stars

Details On the importance of the decay-induced Lorentz force to the photospheric structure of hot magnetic stars On the importance of the decay-induced Lorentz force to the photospheric structure of hot magnetic stars

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..437l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 15, 1987, p. 437-450. NSERC-DFG-supported re

Astronomy and Astrophysics

Astronomy

19

Hot Stars, Lorentz Force, Magnetic Stars, Photosphere, Stellar Atmospheres, A Stars, B Stars, Hydrogen, Main Sequence Stars, White Dwarf Stars

Scientific paper

The question of whether the Lorentz force may realistically be neglected in constructing model atmospheres of magnetic Ap and Bp stars is examined anew. It is argued that previous discussions of the problem do not answer this question. The conventional model of a magnetic Ap or Bp star is considered, and it is suggested that if the star is a slow rotator and has a suitable field configuration, the dominant atmospheric Lorentz force is due to currents induced in the atmosphere by the decay of the global field, and is generally negligible except at a small optical depth. The same model is extended to magnetic white dwarfs; in this case, however, it is found that the Lorentz force due to global field decay may be quite important for a white dwarf with a hydrogen-rich atmosphere. Finally, the way in which the Lorentz force may affect the atmosphere where it is important is briefly considered.

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