Fig. 6
HRD for the sample of O stars in Cygnus OB2 with reliable astrometry using Geneva (Ekström et al. 2012, left) and Bonn (Brott et al. 2011, right) evolutionary stellar tracks and isochrones. Non-rotating models are on the top and rotating models on the bottom. The sample is also subdivided into the spatial groups found by Berlanas et al. (2019). Mean uncertainties are ~0.01 dex in log Teff and ~0.05 dex in log(L∕L⊙).
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