Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...454..295f&link_type=abstract
Astronomy and Astrophysics, Volume 454, Issue 1, July IV 2006, pp.295-299
Astronomy and Astrophysics
Astrophysics
6
Stars: Activity, Stars: Individual: Hk Lacertae, Stars: Late-Type, Stars: Rotation, Stars: Starspots
Scientific paper
Long-term photographic photometry of the active long-period RS CVn binary HK Lac (HD 209813) was obtained from more than 2000 Sonneberg Sky-Patrol plates taken between 1956 and 1996. We achieve an internal accuracy of 0.07 m. The correspondence with contemporaneous high-precision photoelectric photometry from automatic telescopes is striking and successfully demonstrates the feasibility of our approach. Based on a Bayesian time series analysis, we improve the previously published cycle period to 13.37± 0.08 years, and present evidence of an additional period of 9.48± 0.13 years. This establishes the multi-periodicity of dynamo action in these overactive stars as compared to the Sun. The already known 6.7-years cycle turns out to be an overtone of the dominating 13.4-years cycle. Our long-term photographic photometry even allowed the detection of the star's mean rotational period of 24.35 days.
Fröhlich Hans-Erich
Kroll Peter
Strassmeier Klaus G.
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