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The Spot Activity of FK Comae Berenices

1991; Cambridge University Press; Volume: 130; Linguagem: Inglês

10.1017/s0252921100079963

2059-9137

L. Jetsu, J. Pelt, I. Tuominen, H. L. Nations,

Astrophysics and Star Formation Studies

Abstract The active regions of FK Comae Berenices show a flip-flop behaviour, i.e. the concentrated part of spot-activity shifts exactly to the other side of stellar surface, and then remains on the same longitude for a time interval from a few years to a decade. The activity shows excellent phase coherence with respect to these two active longitudes separated 180 degrees from each other. FK Comae may provide a physical example of a non-linear dynamo, which shows surprisingly simple observational changes in the pattern of the magnetically induced spot configurations.