Nitrogen abundance (in units of 12 + log (N/H)) versus projected rotational velocity for the O stars analyzed here. The upper (lower) panel shows star swith a mass higher (lower) than 27 M⊙. Evolutionary tracks for different masses are shown in both panels. They were taken from Brott et al. (2011a) and have initial rotational velocities ~100, ~200, ~300 and ~400 km s-1. A horizontal shift corresponding to a factor π/4 to account for an average projection effect has been applied to the theoretical curves.
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