Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..367t&link_type=abstract
Astronomische Nachrichten, vol. 323, no. 3/4, p. 367-370
Astronomy and Astrophysics
Astronomy
23
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.
Berdyugina Svetlana V.
Korpi Maarit Johanna
Tuominen Ilkka
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