On the detectability of starspot magnetic fields

Details On the detectability of starspot magnetic fields On the detectability of starspot magnetic fields

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..152m&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 152-160.

Astronomy and Astrophysics

Astrophysics

17

Dwarf Stars, Magnetic Dipoles, Magnetic Measurement, Starspots, Stellar Magnetic Fields, Dynamo Theory, Position (Location), Stellar Models

Scientific paper

A starspot is considered as the surface manifestation of a submerged magnetic dipole. It seems likely that in red dwarfs the dipole is generated by dynamo action within the outer convection zone. As a result, a starspot-associated dipole is highly decentered. By integrating the field of a decentered dipole over the disk of a spotted star, the effective longitudinal field, the effective transverse field, and the mean surface field are derived. If the axial field in a starspot is 10 kilogauss, it is found that in most favorable cases, the effective longitudinal field is about 150 gauss, the effective transverse field is approximately 1.1 kilogauss, and the mean surface field is roughly 1.3 kilogauss.

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