Left panel: [N /C ] versus [N /O ] ratios (by number) relative to solar values derived in our NGC 55 sample, the average uncertainty is plotted in the right-bottom corner. The evolutionary tracks for three different masses (20, 40 and 60 M⊙), are displayed for solar (solid black lines, Meynet & Maeder 2003) and SMC metallicity (dashed gray lines, Maeder & Meynet 2001). Right panel: position of the sample stars in the [N /O ] – Teff diagram, using the same color and symbol code that in the left panel.
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