Photometric Cycles and Starspot Tracking on LQ Hya

Details Photometric Cycles and Starspot Tracking on LQ Hya Photometric Cycles and Starspot Tracking on LQ Hya

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002padeu..12..123k&link_type=abstract

2nd Workshop of Young Researchers in Astronomy & Astrophysics, Publications of the Astronomy Department of the Eötvös University

Astronomy and Astrophysics

Astrophysics

Scientific paper

Two solar-like magnetic activity tracers, long-term cyclic behaviour and short-term change in starspot distribution are investigated on the single K2 dwarf LQ Hya. Using the available photoelectric observations back to 17 years, we find 2.7, 4.2 and ~13 year-long cycles, that remind us of the multi-periodic Sun. On a much shorter timescale, we search for surface differential rotation pattern on the star. For this we reconstruct two surface temperature distribution maps (Doppler-images) in two epochs with an interval of 20 days, then the consecutive surface maps are cross-correlated. We find evidence for solar-like (i.e., equatorially accelerated) surface differential rotation.

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