Long Term SPOT Activity on Eclipsing RS CVn Stars: RS CVn, SS Boo, and MM HER

Astronomy and Astrophysics – Astronomy

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Binaries: Eclipsing, Binaries: Close, Stars: Chromospheres

Scientific paper

Using all data available to us, we model the long term spot activity of three eclipsing RS CVn stars with periods between four and eight days: RS CVn, MM Her, and SS Boo. We use the Information Limit Optimization Technique of Budding and Zeilik (1987) to model the spot longitude, latitude, and radius for each available light curve. Contrary to the case for short (<1 day) period RS CVns, the spots seem to occur at all possible longitudes rather than in fixed active longitude belts. We also find spots at both high and low latitudes. We examine possible long term trends in the evolution of the spot activity, including both the total area covered by spots and spot migration patterns. For the best light curves, we remove the spot effects to find clean fits for binary star parameters.

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