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Can we predict the magnetic properties of PMS stars from their H-R diagram location?

Published online by Cambridge University Press:  07 August 2014

S. G. Gregory ,
J.-F. Donati ,
J. Morin ,
G. A. J. Hussain ,
N. J. Mayne ,
L. A. Hillenbrand  and
M. Jardine
S. G. Gregory
Affiliation:
School of Physics & Astronomy, University of St Andrews, St Andrews, KY16 9SS, U.K. email: sg64@st-andrews.ac.uk
J.-F. Donati
Affiliation:
UPS-Toulouse/CNRS-INSU, IRAP UMR 5277, Toulouse, F31400France
J. Morin
Affiliation:
Inst. für Astrophysik, Univ. Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
G. A. J. Hussain
Affiliation:
ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
N. J. Mayne
Affiliation:
School of Physics, University of Exeter, Exeter EX4 4QL, U.K.
L. A. Hillenbrand
Affiliation:
California Institute of Technology, MC 249-17, Pasadena, CA 91125, U.S.A.
M. Jardine
Affiliation:
School of Physics & Astronomy, University of St Andrews, St Andrews, KY16 9SS, U.K. email: sg64@st-andrews.ac.uk
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Abstract

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Spectropolarimetric observations combined with tomographic imaging techniques have revealed that all pre-main sequence (PMS) stars host multipolar magnetic fields, ranging from strong and globally axisymmetric with ≳kilo-Gauss dipole components, to complex and non-axisymmetric with weak dipole components (≲0.1 kG). Many host dominantly octupolar large-scale fields. We argue that the large-scale magnetic properties of a PMS star are related to its location in the Hertzsprung-Russell diagram. This conference paper is a synopsis of Gregory et al. (2012), updated to include the latest results from magnetic mapping studies of PMS stars.

Keywords

stars: evolutionstars: interiorsstars: magnetic fieldstars: pre-main sequence

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