Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..263p&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
Tomographic techniques enable one to reconstruct the magnetic topology of solar-type stars from time-series of polarized spectra. Depending on the spatial resolution accessible, the geometry of the background field or the surface distribution of individual active regions can be reconstructed, as well as their short-term evolution over a few weeks (for instance under the action of differential rotation) or their secular variations related to activity cycles. I propose here a brief review of the main results obtained to date in this framework and detail what this observing study tells us about dynamo processes at work in cool active stars. I then indicate some new directions that will be explored in the near future thanks to the larger spectral coverage and better sensitivity of the new instrumentation now available (ESPaDOnS/CFHT).
Donati Jean-Francois
Petit Pacal
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