Fig. 7
Comments are as for Fig. 6 except that in these stars, the helium lines are entirely shifted to the 3He rest wavelength and no traces of 4He are visible. For comparison, the He lines of SB 290 are plotted in the lowest panel. This star is the prototype of sdBs enriched in 3He (Heber 1987) but note that the lines show significant rotational broadening (Geier et al. 2013).
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.