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Magnetic fields at the surfaces of stars

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The Astronomy and Astrophysics Review Aims and scope

Summary

Magnetic fields have now been detected in stars in several parts of the Hertzsprung-Russell diagram. Roughly dipolar fields ranging in strength between 3× 102 and 3×104 G are found in many chemically peculiar A and B main sequence stars. Dipolar fields are also found in some 2–3% of white dwarfs, but with strengths between 1×106 and 5×108 G. In both these types of stars, the observed fields vary as the underlying star turns, but do not change in a secular manner. In solartype stars, structurally complex fields of a few kG are found with filling factors of the order of 0.1 to 0.8. Further indirect evidence of fields in cool main sequence stars is provided by detection of visible and ultraviolet line emission (chromospheric activity), x radiation (coronal matter), and giant starspots. In this review, we survey the observations of stellar magnetism in all these types of stars, as well as efforts to model the observed magnetic fields and associated photospheric peculiarities and activity.

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Authors and Affiliations

  1. Department of Astronomy, University of Western Ontario, N6A 3K7, London, Ontario, Canada

    J. D. Landstreet

  2. Observatoire Midi-Pyrénées, 14, ave. Edouard-Belin, F-31400, Toulouse, France

    J. D. Landstreet

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Landstreet, J.D. Magnetic fields at the surfaces of stars. The Astron Astrophys Rev 4, 35–77 (1992). https://doi.org/10.1007/BF00873569

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