Similarities and Differences Between the Light Variability of the K Giant and Dwarf Active Binaries HK Lac and BY Dra
The long term light and color (B-V, U-B) variations of BY Dra and HK Lac are discussed. Cyclic behaviour of the visual and U-B color variation of HK Lac has been found with a period of 5.4 years, showing 0.3 phase shift between the V(mean) and U-B cycles. A possible explanation of the feature is given.
KeywordsColor Variation Cyclic Behaviour Spot Activity Chromospheric Activity Poster Paper
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