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Fig. 5

image

[N/O] abundance ratio as a function of vsin i. Theoretical predictions for different masses and rotational velocities are from the Geneva (left) and Bonn (right) groups. Initial stellar masses (in solar units) are indicated. Rotational velocities at the ZAMS are listed in Table 1. Predicted rotational velocities have been multiplied by sin(70°) to take the projection effect into account (see Table 1); however, a slightly different choice would not affect these plots in any significant way. Solid lines in both models represent the MS phase, while dashed lines for the Bonn models represent the supergiant phase. Symbols and related colours are the same as in Fig. 4.

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