Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-26T04:46:59.817Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

Bopp, B.W., Stencel, R.E.: 1981, Astrophys. J. Letters 247, 131 CrossRefGoogle Scholar
Jetsu, L., Huovelin, J., Tuominen, I., Vilhu, O., Bopp, B.W., Parola, P.: 1990a, Astron. Astrophys. 236, 423 Google Scholar
Jetsu, L., Huovelin, J., Tuominen, I., Bopp, B.W., Efimov, Yu.S., Linnaluoto, S., Nations, H.L., Piirola, P., Shakhovskoy, N.M., Virtanen, H.: 1990b, Astron. Astrophys. Suppl. 85, 813 Google Scholar
McCarthy, J.K., Ramsay, L.W.: 1984, Astrophys. J. 283, 200 Google Scholar
Pelt, J.: 1983 ESA Spec. Publ., ESA SP-201, 37 Google Scholar
Walter, F.M., Basri, G.S.: 1982, Astrophys. J. 260, 735 Google Scholar