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Exploring the magnetic topologies of cool stars

Published online by Cambridge University Press:  26 August 2011

J. Morin ,
J.-F. Donati ,
P. Petit ,
L. Albert ,
M. Auriére ,
R. Cabanac ,
C. Catala ,
X. Delfosse ,
B. Dintrans  and
R. Fares
...Show all authors
J. Morin
Affiliation:
Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland email: [email protected] LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
J.-F. Donati
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
P. Petit
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
L. Albert
Affiliation:
CFHT, 65-1238 Mamalahoa Hwy, Kamuela HI 96743, USA
M. Auriére
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
R. Cabanac
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
C. Catala
Affiliation:
LESIA, Observatoire de Paris-Meudon, 92195 Meudon, France
X. Delfosse
Affiliation:
LAOG, UMR5571 CNRS, Universit Joseph Fourier, BP 53, 38041 Grenoble, France
B. Dintrans
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
R. Fares
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
T. Forveille
Affiliation:
LAOG, UMR5571 CNRS, Universit Joseph Fourier, BP 53, 38041 Grenoble, France
T. Gastine
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
M. Jardine
Affiliation:
School of Physics and Astronomy, University of St Andrews, St Andrews, ScotlandKY16 9SS
R. Konstantinova-Antova
Affiliation:
Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko shose, Sofia, Bulgaria
J. Lanoux
Affiliation:
Centre dEtude Spatiale des Rayonnements, Universit de Toulouse, CNRS, France
F. Lignires
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
A. Morgenthaler
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
F. Paletou
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
J.C. Ramirez Velez
Affiliation:
LESIA, Observatoire de Paris-Meudon, 92195 Meudon, France
S.K. Solanki
Affiliation:
Max-Planck Institut fr Sonnensystemforschung, Katlenburg-Lindau, Germany
S. Thado
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
V. Van Grootel
Affiliation:
LATT, Universit de Toulouse, CNRS, 14 Av. E. Belin, 31400 Toulouse, France
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Abstract

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Magnetic fields of cool stars can be directly investigated through the study of the Zeeman effect on photospheric spectral lines using several approaches. With spectroscopic measurement in unpolarised light, the total magnetic flux averaged over the stellar disc can be derived but very little information on the field geometry is available. Spectropolarimetry provides a complementary information on the large-scale magnetic topology. With Zeeman-Doppler Imaging (ZDI), this information can be retrieved to produce a map of the vector magnetic field at the surface of the star, and in particular to assess the relative importance of the poloidal and toroidal components as well as the degree of axisymmetry of the field distribution.

The development of high-performance spectropolarimeters associated with multi-lines techniques and ZDI allows us to explore magnetic topologies throughout the Hertzsprung-Russel diagram, on stars spanning a wide range of mass, age and rotation period. These observations bring novel constraints on magnetic field generation by dynamo effect in cool stars. In particular, the study of solar twins brings new insight on the impact of rotation on the solar dynamo, whereas the detection of strong and stable dipolar magnetic fields on fully convective stars questions the precise role of the tachocline in this process.

Keywords

Stars: low-massbrown dwarfsstars: magnetic fieldsstars: activitystars: rotationtechniques: spectroscopictechniques: polarimetric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 181 - 187
Copyright
Copyright © International Astronomical Union 2011

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