The Many Cycles of Cool Stars

Details The Many Cycles of Cool Stars The Many Cycles of Cool Stars

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..66s&link_type=abstract

Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,

Computer Science

Scientific paper

Magnetic activity exhibits a rich range time behaviour in cool stars, from cyclic, to multi-cyclic, anharmonically variable, various combinations of these, and finally to the virtually non-variable. I assemble data on cycle periods, amplitudes, and anharmonic degrees, and compare these various key stellar properties, such as rotation, differential rotation, binarity, mass, and convective timescales, in a search for correlations to guide and compare with dynamo theory. The data come from a broad range of observational sources from the typical (Ca II HK emission, photometry) to more the exotic (orbital period variations). The nature of the variation can sometime depend on the diagnostic used. The trends seen (and sometimes lack thereof) pose important tests of dynamo models. I also explore stars with very low activity variability. These seem to be composed of (at least) two kinds: a group of stars which may be unable to cycle, and a group whose dynamos may be temporarily quiescent. Both offer further important clues for how dynamos operate, and the properties which govern them.

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