Surface nitrogen abundance as a function of helium abundance, YHe = N(He)/N(H) (left), and projected rotational rate (right). The corresponding predictions for the O-type phase (Teff ≥ 29 kK) are overplotted. Symbols and colours as in Fig. 15; open/filled symbols denote objects with Minit (HRD) larger/smaller than 32 M⊙ (Geneva grids) and 30M⊙ (Bonn grids), respectively. For a number of tracks, the end of the O-star phase is indicated by horizontal arrows. Model Vrot has been multiplied by π/4 to take the average projection effect into account (e.g. vinit ≈ 300 km s−1 corresponds to v sin i ≈ 240 km s−1). Upper right panel: coloured parts of some tracks represent the dwarf (log g > 3.75, red) and the giant (3.75 < log g < 3.6, blue) phases, respectively.
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