EAS Publications Series
Volume 57, 2012Low-Mass Stars and the Transition Stars/Brown Dwarfs - Evry Schatzman School on Stellar Physics XXIII
|Page(s)||165 - 191|
|Published online||30 November 2012|
C. Reylé, C. Charbonnel and M. Schultheis (eds)
EAS Publications Series, 57 (2012) 165-191
Magnetic Fields from Low-Mass Stars to Brown Dwarfs
1 Dublin Institute for Advanced
Studies, School of Cosmic Physics, 31 Fitzwilliam Place, Dublin
2 Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany ;
Magnetic fields have been detected on stars across the H-R diagram and substellar objects either directly by their effect on the formation of spectral lines, or through the activity phenomena they power which can be observed across a large part of the electromagnetic spectrum. Stars show a very wide variety of magnetic properties in terms of strength, geometry or variability. Cool stars generate their magnetic fields by dynamo effect, and their properties appear to correlate – to some extent – with stellar parameters such as mass, rotation, and age. With the improvements of instrumentation and data analysis techniques, magnetic fields can now be detected and studied down to the domain of very-low-mass stars and brown dwarfs, triggering new theoretical works aimed, in particular, at modelling dynamo action in these objects. After a brief discussion on the importance of magnetic field in stellar physics, the basics of dynamo theory and magnetic field measurements are presented. The main results stemming from observational and theoretical studies of magnetism are then detailed in two parts: the fully-convective transition, and the very-low mass stars and brown dwarfs domain.
© EAS, EDP Sciences 2012
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