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Fig. 2

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Panel a) the blue curve is the median equatorial velocity (4/π)⟨vsini⟩ for each spectral type from Głębocki & Gnaciński (2005). The green curve shows the equatorial velocity of the Kepler targets, , derived from the measured rotation periods and the KIC radii. The black points show measurements by Reiners et al. (2012). In this sample 201 stars have an upper vsini limit of 4 km s-1 (due to instrumental limitations), these stars are represented by the solid bar. Panel b) rotation periods Prot of the stars in our sample, averaged within each spectral type. Panel c) same as panel b), but for comparison we show the median of the rotation periods measured by McQuillan et al. (2013) (black points with errorbars), for the stars overlapping with our sample. Similarly, the red curve shows the median of the rotation periods found by Debosscher et al. (2011). Shaded areas and error bars span the upper and lower 34th percentile values from the median.

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