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The Spot Activity of FK Comae Berenices

Published online by Cambridge University Press:  12 April 2016

Lauri Jetsu ,
Jaan Pelt ,
Ilkka Tuominen  and
Harold Nations
Lauri Jetsu
Affiliation:
Observatory and Astrophysics Laboratory, University of Helsinki, Tähtitorninmäki, SF–00130 Helsinki, Finland
Jaan Pelt
Affiliation:
Tartu Astrophysical Observatory, Tóravere, Estonia, USSR
Ilkka Tuominen
Affiliation:
Observatory and Astrophysics Laboratory, University of Helsinki, Tähtitorninmäki, SF–00130 Helsinki, Finland
Harold Nations
Affiliation:
Franklin and Marshall College, Lancaster, Pennsylvania 17604, USA

Abstract

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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.

Type
Part IV Stellar activity
Information
International Astronomical Union Colloquium , Volume 130: The Sun and Cool Stars: activity, magnetism, dynamos , 1991 , pp. 381 - 383
Copyright
Copyright © Springer-Verlag 1991

References

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