Fig. 12.
Comparison between the rotation period distributions in Ru 147 (green), NGC 6819 (red), and rotational isochrones for 2.5 Gyr from Amard et al. (2019, dotted), Barnes (2010, solid), and Spada & Lanzafame (2020, dashed). The Spada & Lanzafame (2020) models come closest to the measured Ru 147 rotation periods in the mid-K to mid-M region, with a relatively flat morphology in the K star region and an upturn among the early M stars.
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