Free Access

Fig. 9


Li and Na abundances for TO and SGB stars in NGC 6397 (data from Paper I, with improved non-LTE derivation). The initial [Na/Fe], shown on the abscissa, has been estimated by correcting A(Na) for atomic diffusion by  + 0.2 dex and assuming  [Fe/H]  =  −2.1 for all stars. The red bullets represent turn-off stars and the blue stars subgiants. Superimposed are the theoretical predictions for the chemical composition of the matter out of which second generation low-mass stars are expected to form in the WFRMS scenario. The tracks shown correspond to the cases of 20 M and 120 M polluter stars (dashed and full lines, respectively) assuming different values (0.2, 0.4, 0.6, 0.8) for the minimum dilution coefficient. See text for more details.

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.