For Kepler main-sequence F, G, and K dwarfs, the photometric activity index Sph shows a spectral-type-dependent relation with Rossby number, including a dip near Ro/Ro_sun ~0.3 for G and K dwarfs.
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Magnetic activity evolution of solar-like stars: II. $S_{\rm ph}$-Ro evolution of Kepler main-sequence targets
For Kepler main-sequence F, G, and K dwarfs, the photometric activity index Sph shows a spectral-type-dependent relation with Rossby number, including a dip near Ro/Ro_sun ~0.3 for G and K dwarfs.