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General Model for Light curves of Chromospherically Active Binary Stars
L. Jetsu, G. W. Henry, J. Lehtinen
The starspots on the surface of many chromospherically active binary stars concentrate on long--lived active longitudes separated by 180 degrees. The activity shifts between these…
Real light curves of FK Comae Berenices: Dead end
L. Jetsu
Recently, we presented a general model for the light curves of chromospherically active stars, where the observed light curve is interference of two real constant period light curv…
Shifting Milestones of Natural Sciences: The Ancient Egyptian Discovery of Algol's Period Confirmed
Lauri Jetsu, Sebastian Porceddu
The Ancient Egyptians wrote Calendars of Lucky and Unlucky Days that assigned astronomically influenced prognoses for each day of the year. The best preserved of these calendars is…
Time series analysis of long-term photometry of BM Canum Venaticorum
L. Siltala, L. Jetsu, T. Hackman +10
Studying RS CVn binaries is challenging, because in addition to spot activity, other effects such as mass transfer between the components and gravitational distortion of their sphe…