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

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

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.

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