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Magnetic field at the inner disk edge

Published online by Cambridge University Press:  01 May 2007

Moira Jardine ,
Scott G. Gregory  and
Jean-François Donati
Moira Jardine
Affiliation:
SUPA, School of Physics and Astronomy, North Haugh, St Andrews, UK, KY16 9SS email: [email protected], [email protected]
Scott G. Gregory
Affiliation:
SUPA, School of Physics and Astronomy, North Haugh, St Andrews, UK, KY16 9SS email: [email protected], [email protected]
Jean-François Donati
Affiliation:
Laboratoire dAstrophysique, Observatoire Midi-Pyrénées, 14 Av. E. Belin, F-31400 Toulouse, France email: [email protected]
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Abstract

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Our present understanding of the coronal structure of T Tauri stars is fragmentary and observations in different wavelength regimes often appear to give contradictory results. X-ray data suggest the presence of magnetic loops on a variety of scales, from compact loops of size less than a stellar radius, up to very large loops of up to 10 stellar radii which may connect to the disk. While some stars show a clear rotational modulation in X-rays, implying distinct bright and dark regions, many do not. This picture is complicated by the accretion process itself, which also contributes to the X-ray emission. The location of the inner edge of the accretion disk and the nature of the magnetic field there are still hotly-contested issues. Accretion indicators often suggest the presence of discrete accretion funnels. This has implications for the structure of the corona, as does the presence of an outflowing wind. All of these factors are linked to the structure of the magnetic field, which we are now beginning to unravel through Zeeman-Doppler imaging. In this review I will describe the present state of our understanding of the magnetic structure of T Tauri coronae and the impact this has during such an early evolutionary stage.

Keywords

Stars:coronae
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S243: Star-Disk Interaction in Young Stars , May 2007 , pp. 51 - 62
Copyright
Copyright © International Astronomical Union 2007

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