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Fig. 9


Nitrogen-to-carbon ratio as a function of luminosity. Circles correspond to stars with M ≤ 23 M, squares indicate stars with 23 <M< 33 M, triangles show stars with 33 <M< 50 M and pentagons show stars with M ≥ 50 M. Open (filled) symbols correspond to stars with vsin   i ≥ 200 km s-1 (≤, resp.). Stellar evolution models taken from Brott et al. (2011a) for M = 20, 25, 40 and 60 M are overplotted: dashed (solid, dotted) lines correspond to models with vsin   i ≳ 400 (300, 100) km s-1.

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