SPOT and flare activity of FK Comae Berenices: Long-term photometry

Details SPOT and flare activity of FK Comae Berenices: Long-term photometry SPOT and flare activity of FK Comae Berenices: Long-term photometry

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...278..449j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 278, no. 2, p. 449-462

Astronomy and Astrophysics

Astrophysics

73

H Alpha Line, Starspots, Stellar Flares, Stellar Models, Stellar Rotation, Ultraviolet Emission, Variable Stars, Absorption Spectra, Angular Momentum, Brightness, Light Curve, Radial Velocity, Ultraviolet Photometry

Scientific paper

A quarter of a century of photometry of FK Comae Berenices is presented and the photometric rotation period is improved to Pphot = 2.4002466 d +/- 0.0000056 d. For a model with constant photometric rotation period, the concentrated part of the spot activity has remained on two active longitudes 180 degrees apart, and a switch of the activity ('flip-flop') between these two longitudes has occurred three times during 25 years. On the other hand, a model with varying photometric period gives an upper limit of 2.4% for the differential rotation. These two apparently contradictory models can be reconciled, if the source of time dependence of the distribution of the spot activity of FK Comae is analogous to the solar active longitudinal zones. The variation of the mean brightness and the amplitude of the rotational modulation of brightness is not periodic, although some correlation with changes of the active longitudes may be present. The flaring activity seems to concentrate on the same active longitudes, but originates predominantly from the brighter hemisphere.

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