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Photospheric stellar activity cycles

Published online by Cambridge University Press:  01 August 2006

Katalin Oláh
Katalin Oláh*
Affiliation:
Konkoly Observatory, P.O. Box 67, HU-1525 Budapest, Hungary email: olah@konkoly.hu
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Abstract

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Cycle lengths of active stars are derived from long-term photometric monitoring of their secular light variability. With the help of photographic data archives the lengths of the datasets are extended for HK Lac and V833 Tau. Using time-frequency analysis it is shown that the cycles are continuously changing in time. Thus, the reported cycle lengths derived by simple Fourier analysis are mean values that are valid only for a given time interval.

Keywords

stars: spotsstars: activitystars: atmospheresstars: late-typestars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Highlights of Astronomy 14: Highlights of Astronomy , August 2006 , pp. 283 - 284
Copyright
Copyright © International Astronomical Union 2007

References

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