Free Access

Fig. 2.


Left: mean [N/C] ratio of the clusters analysed in this work (red diamonds) computed using only the member stars. The C and N abundances flagged as uncertain in Table 6 are not shown. The error bars depict the typical uncertainty in [N/C] propagated from the uncertainties in C and N listed in Table 7 and not the cluster scatter. Most clusters have good C and N abundances for one giant alone. A few selected results from the literature are included as blue symbols (Tautvaišien˙e et al. 2015, 2016; Drazdauskas et al. 2016a,b). Right: [N/C] ratio, in LTE, of selected Cepheids. References are given in Table 4. Two Cepheids suspected to be at the first crossing are shown as red stars; the other Cepheids are indicated as solid circles. The models of Lagarde et al. (2012), shown as black lines, extend only up to 6 M. The models of Ekström et al. (2012) are shown as blue lines and those from Bressan et al. (2012) as an orange line.

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.