Fig. 14
Upper three panels: long-term behaviour of the b − y, B − V, and V − IC colour indices, which reflect the global temperature changes of the star. Bottom panel: starspot temperatures using photometry and Doppler Imaging. The data points for the Doppler-map temperatures are from this paper, Korhonen et al. (1999, 2000, 2007). The horizontal line at 5000 K shows the unspotted temperature.
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