HR diagram for Cyg OB2 with the non rotating isochrones of Schaller et al. (1992; solid lines) and the rotating isochrone of (Meynet & Maeder 2005; dashed line) overplotted. Data from Negueruela et al. (2008) and Hanson et al. (2003); the reader is refered to these studies for the positions of individual stars, which have been omitted here for reasons of clarity.
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