Free Access

Fig. 5

thumbnail

Upper panel: the measurements of Ca ii λ3934 S-index. Lower panel: the GLS periodogram of Ca ii λ3934 shows a clear peak corresponding to a period of P = 36 d. However, the error bar of the individual measurement is large and the period is close to the observational time window of about 1 month.

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.