Fig. 6

Ratios of alpha elemements to iron for our programme stars (filled circles) compared to those of the stars of Bonifacio et al. (2009) (open circles). The spectra of SDSS J004029+160416 and SDSS J002113-005005 observed in periods 78 and 81 were treated independently and the points referring to the derived abundances are connected by a line. The one referring to the two measures of SDSS J004029+160416 is not visible, since the two points are indistinguishable at the resolution of the plot.
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.