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Fig. C.1

image

Top: ratio of median chromospheric Ca II H and K flux to bolometric flux, , vs. BV. The symbolsand colour palette are the same as in Fig. 2. The Sun at minimum activity is shown by the black ⊙ symbol. The dashed grey lines indicate the Vaughan-Preston gap, as seen in Fig. 2 of Noyes et al. (1984a). The histogram on the right shows the distribution of the median chromospheric activity, and the histogram at the top shows the distribution of BV for stars in the catalogue. Bottom: normalised distribution of the median for different ranges of BV, where the area below each distribution is normalised to 1. The vertical dashed lines indicate the approximate position of the Vaughan-Preston gap.

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