Hostname: page-component-76fb5796d-5g6vh Total loading time: 0 Render date: 2024-04-26T06:54:25.750Z Has data issue: false hasContentIssue false
  • English
  • Français

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: jmorin@cp.dias.ie 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
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Auriēre, M., et al. , 2010, Astron. Astrophys, 516, L2CrossRefGoogle Scholar
Brown, B. P., Browning, M. K., Brun, A. S., Miesch, M. S., Toomre, J., 2010, Astrophys. J., 711, 424CrossRefGoogle Scholar
Browning, M. K., 2008, Astrophys. J., 676, 1262Google Scholar
Chabrier, G., Baraffe, I., 1997, Astron. Astrophys, 327, 1039Google Scholar
Charbonneau, P., MacGregor, K. B., 1997, Astrophys. J., 486, 502Google Scholar
Donati, J.-F., Semel, M., Carter, B. D., Rees, D. E., Cameron, A. C., 1997, Mon. Not. Roy. Astron. Soc., 291, 658CrossRefGoogle Scholar
Donati, J.-F. & Brown, S. F., 1997, Astron. Astrophys, 326, 1135Google Scholar
Donati, J.-F., et al. , 2003, Mon. Not. Roy. Astron. Soc., 345, 1145CrossRefGoogle Scholar
Donati, J.-F., 2003, ASPC, 307, 41Google Scholar
Donati, J.-F., et al. , 2006, Science, 311, 633CrossRefGoogle Scholar
Donati, J.-F., et al. , 2008, Mon. Not. Roy. Astron. Soc., 390, 545Google Scholar
Donati, J.-F., et al. , 2010, Mon. Not. Roy. Astron. Soc., 402, 1426Google Scholar
Fares, R., et al. , 2009, Mon. Not. Roy. Astron. Soc., 398, 1383Google Scholar
Hall, J. C., Lockwood, G. W., & Skiff, B. A., 2007, AJ, 133, 862CrossRefGoogle Scholar
Morin, J., et al. , 2008a, Mon. Not. Roy. Astron. Soc., 384, 77Google Scholar
Morin, J., et al. , 2008b, Mon. Not. Roy. Astron. Soc., 390, 567Google Scholar
Morin, J., Donati, J.-F., Petit, P., Delfosse, X., Forveille, T., & Jardine, M. M., 2010, Mon. Not. Roy. Astron. Soc., 407, 2269Google Scholar
Parker, E. N., 1955, Astrophys. J., 122, 293Google Scholar
Petit, P., Donati, J.-F., Collier, Cameron A., 2002, Mon. Not. Roy. Astron. Soc., 334, 374Google Scholar
Petit, P., et al. , 2008, Mon. Not. Roy. Astron. Soc., 388, 80CrossRefGoogle Scholar
Petit, P., et al. , 2009, Astron. Astrophys, 508, L9Google Scholar
Phan-Bao, N., Lim, J., Donati, J.-F., Johns-Krull, C. M., & Martín, E. L., 2009, Astrophys. J., 704, 1721Google Scholar
Saar, S. H., 1988, Astrophys. J., 324, 441CrossRefGoogle Scholar
Sanderson, T. R., Appourchaux, T., Hoeksema, J. T., & Harvey, K. L., 2003, JGRA, 108, 1035CrossRefGoogle Scholar
Schrijver, C. J., Cote, J., Zwaan, C., & Saar, S. H., 1989, Astrophys. J., 337, 964Google Scholar
Semel, M., 1989, Astron. Astrophys, 225, 456Google Scholar
Spiegel, E. A. & Zahn, J.-P., 1992, Astron. Astrophys, 265, 106Google Scholar