Fig. 9
Rotation periods vs. (B−V) indices of the M 34 sample stars. The solid line represents the I sequence defined by Barnes (2007). The dashed line represents the C sequence determined by Meibom et al. (2011). M 34 stars represented as blue circles belong to the I sequence. M 34 stars represented as red square belong to the C sequence. Grey triangles represent M 34 gap stars assumed to be evolving from the C sequence towards the I sequence.
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