Free Access

Fig. 3.


Lomb-Scargle periodograms and distribution of periods in the bootstrap approach of the X-ray and optical data. Upper left panel: Lomb-Scargle periodogram of the X-ray data. The FAP levels of 50 and 80% resulting from the bootstrap analysis described in Sect. 3.3 are marked as blue lines. Upper right panel: distribution of maximum periods determined for all 104 repetitions. Lower panels: results of a similar analysis of the optical data. No FAP levels are displayed here, since none of the bootstrap repetitions yielded a higher Lomb-Scargle power than the unperturbed data.

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.