Flip-Flops as Observational Signatures of Different Dynamo Modes in Cool Stars

Details Flip-Flops as Observational Signatures of Different Dynamo Modes in Cool Stars Flip-Flops as Observational Signatures of Different Dynamo Modes in Cool Stars

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..224..153f&link_type=abstract

Solar Physics, Volume 224, Issue 1-2, pp. 153-160

Physics

17

Scientific paper

Cool, rapidly rotating stars exhibit enhanced magnetic activity with cyclic behavior on various time scales. In particular, the longitude of the dominant activity region switches quasi-periodically by 180∘, which is known as the “flip-flop” phenomenon. In the present paper we introduce a new approach for the interpretation of stellar cycles based on light curve modeling with dipole and quadrupole dynamo modes. We discuss the observational signatures of different combinations of the dynamo modes. The proposed simple model is able to reproduce the basic properties of long-term photometric behavior of active stars and allows us to study different mechanisms resulting in flip-flops.

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