Fig. 1
Positions of the Cygnus O-type stars in the HR diagram. Evolutionary tracks and isochrones are from Brott et al. (2011a) and were computed for vrotinit = 100 km s-1 (black lines) and for vrotinit = 400 km s-1 (red lines). Isochrones, represented by dashed lines, correspond to ages ranging from 2 to 8 Myr with a step of 2 Myr.
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