Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26arv...4...35l&link_type=abstract
Astronomy and Astrophysics Review (ISSN 0935-4956), vol. 4, no. 1, June 1992, p. 35-77.
Astronomy and Astrophysics
Astrophysics
102
A Stars, Magnetic Stars, Peculiar Stars, Stellar Activity, Stellar Magnetic Fields, White Dwarf Stars, B Stars, Cool Stars, Magnetic Field Configurations, Starspots, Stellar Models
Scientific paper
Magnetic fields have now been detected in stars in several parts of the Hertzprung-Russell diagram. Roughly dipolar fields ranging in strength between 3 x 100 and 3 x 10,000 G are found in many chemically peculiar A and B main sequence stars. Dipolar fields are also found in some 2-3 percent of white dwarfs, but with strengths between 1 x 10 exp 6 and 5 x 10 exp 8 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 solar-type 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. 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 are reviewed.
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