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Similarities and Differences Between the Light Variability of the K Giant and Dwarf Active Binaries HK Lac and BY Dra

Part of the NATO ASI Series book series (ASIC, volume 319)

Abstract

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.

Keywords

Color Variation Cyclic Behaviour Spot Activity Chromospheric Activity Poster Paper 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • K. Olah
    • 1
  1. 1.Konkoly ObservatoryBudapestHungary

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