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Fig. 10


HR diagram of OB stars in the Cygnus region (Cygnus OB2, Cygnus OB9 and field population) assuming a DM = 10.8 mag. Known OB stars from Comerón & Pasquali (2012) are also included to complete the sample. Black and orange dots indicate the already known and new OB-type stars respectively. Blue crosses indicate those new stars classified as possible or confirmed SB2 stars. Isochrones (dotted lines) and evolutionary stellar tracks (solid lines) for non-rotating models are from Ekström et al. (2012). Late-B stars are also included.

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