Fig. 10

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.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.