Evolution of the rotation period (top) and Rossby number computed with the turnover timescale τ(Hp/ 2) (bottom) from the ZAMS up to the RGB tip for the 2 M⊙, Z⊙ models computed with different initial rotation velocities on the ZAMS (50, 110, 163, and 250 km s-1). The dotted horizontal line indicates a Ro equal to 1, which is the typical value to invoke α − Ω dynamo.
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