Starspot cycles from Doppler imaging and photometric time series as nonlinear dynamo

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stellar Cycles, Surface Imaging, Stellar Dynamos

Scientific paper

In this paper we present evidence of strongly nonaxisymmetric spot distributions in magnetically very active late-type stars, with a special cyclic behaviour (the "flip-flop" effect), which is basically different from the cycles in solar-like older and less active stars. The analysis is based both on high-resolution spectroscopy with Doppler imaging methods and on long photometric time series. Theoretical implications of these results are discussed from the point of view of nonlinear mean-field dynamo theory.

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