Free Access

Fig. 8


Nitrogen abundance (in units of 12 + log (N/H)) versus projected rotational velocity for the O stars analyzed here. The upper (lower) panel shows star swith a mass higher (lower) than 27 M. Evolutionary tracks for different masses are shown in both panels. They were taken from Brott et al. (2011a) and have initial rotational velocities ~100, ~200, ~300 and ~400 km s-1. A horizontal shift corresponding to a factor π/4 to account for an average projection effect has been applied to the theoretical curves.

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.