Rotational periods and effective temperatures of the stars as a function of age. Stars with simple cycles are plotted with red dots, stars with complex cycles with blue squares, and the Sun with an orange star. Stars from van Saders et al. (2016) are plotted with magenta crosses, four stars with log g> 4.4 are marked with green circles. The components of the wide binaries HD 131156A/B and HD 201091/HD 201092 are connected. Top: rotational periods. The range of the rotational periods in NGC 6819 and M67 at their ages of 2.5 Gyr and 4.2 Gyr are shown by green lines; data are taken from Meibom et al. (2015) and Barnes et al. (2016). Middle and bottom: effective temperatures and masses as a function of age, respectively. See the text for further discussion.
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