Top: color-coded Rossby number Ro(Hp/ 2) along the tracks in the HRD up to the RGB luminosity where Ro(Hp/ 2) becomes higher than 10 (for stellar masses lower than 2.5 M⊙) or up to the early-AGB (for stellar masses higher than 2.5 M⊙), for the Z⊙ models with rotation. Initial stellar masses are indicated on the tracks. Dotted lines indicate the beginning and end of the first dredge-up (when the mass of the convective envelope is 2.5% of the total stellar mass, left; at the maximum extent in mass of the convective envelope, right). The points correspond to the sample stars of Aurière et al. (2015); the size of the black symbols depicts the strength of the detected magnetic field, and open symbols stand for nondetected stars. Bottom: a color-coded logarithm scale is shown for the rotation period (in days) along the tracks and for the sample stars of Aurière et al. (2015) that have known rotation periods (squares).
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