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Magnetic Doppler imaging of II Peg

Published online by Cambridge University Press:  01 November 2008

Oleg Kochukhov ,
N. Piskunov ,
I. Ilyin  and
I. Tuominen
Oleg Kochukhov
Affiliation:
Department of Physics and Astronomy, Uppsala University, 751 20 Uppsala, Sweden
N. Piskunov
Affiliation:
Department of Physics and Astronomy, Uppsala University, 751 20 Uppsala, Sweden
I. Ilyin
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
I. Tuominen
Affiliation:
University of Helsinki, PO Box 14, 00014 Helsinki, Finland
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Abstract

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Rotational modulation of the intensity and polarization spectra of magnetic stars offers a unique possibility to reconstruct the structure of surface magnetic fields and to investigate their relation to cool starspots. We have developed a new magnetic Doppler imaging code which aims at self-consistent temperature and magnetic mapping of cool active stars. Here we present magnetic Doppler imaging analysis of high-resolution circular polarization observations of the active star II Peg. We demonstrate that a self-consistent approach to magnetic inversion unveils stronger magnetic fields than found previously through disjoint analyses of polarization and intensity observations of active stars.

Keywords

Stars: activity – stars: atmospheres – stars: magnetic fields – stars: II Peg

References

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