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Modelling stellar coronal magnetic fields

Published online by Cambridge University Press:  26 August 2011

Moira Jardine ,
Jean-Francois Donati ,
Doris Arzoumanian  and
Aline de Vidotto
Moira Jardine
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK email: mmj@st-andrews.ac.uk, Aline.Vidotto@st-andrews.ac.uk, doris.arzoumanian@cea.fr
Jean-Francois Donati
Affiliation:
LATT, CNRS–UMR 5572, Obs. Midi-Pyrénées, 14 Av. E. Belin, F–31400 Toulouse, France email: donati@ast.obs-mip.fr
Doris Arzoumanian
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK email: mmj@st-andrews.ac.uk, Aline.Vidotto@st-andrews.ac.uk, doris.arzoumanian@cea.fr
Aline de Vidotto
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK email: mmj@st-andrews.ac.uk, Aline.Vidotto@st-andrews.ac.uk, doris.arzoumanian@cea.fr
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Abstract

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Our understanding of the structure and dynamics of stellar coronae has changed dramatically with the availability of surface maps of both star spots and also magnetic field vectors. Magnetic field extrapolations from these surface maps reveal surprising coronal structures for stars whose masses and hence internal structures and dynamo modes may be very different from that of the Sun. Crucial factors are the fraction of open magnetic flux (which determines the spin-down rate for the star as it ages) and the location and plasma density of closed-field regions, which determine the X-ray and radio emission properties. There has been recent progress in modelling stellar coronae, in particular the relative contributions of the field detected in the bright surface regions and the field that may be hidden in the dark star spots. For the Sun, the relationship between the field in the spots and the large scale field is well studied over the solar cycle. It appears, however, that other stars can show a very different relationship.

Keywords

Stars:magnetic fieldsstars:coronaestars:imagingstars:spots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 242 - 248
Copyright
Copyright © International Astronomical Union 2011

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