H-R diagram of the sample stars. Evolutionary tracks and isochrones are taken from Brott et al. (2011a) for an initial rotation rate of 180 km s-1. Evolutionary tracks are annotated in solar masses, and isochrones in Myr from 1 to 7 Myr. Green circles indicate field stars, while squares indicate stars in NGC 346. Blue squares show normal luminosity class V stars, while black squares show Vz-class objects (cf. Sect. 5.2.2). Red squares show the position of the two stars that rotate faster than 300 km s-1.
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