Variability of the He I 10 830 Å triplet. Left: line profiles of the He I 10 830 Å triplet observed in the X-shooter spectra collected during 2010 (black), 2015 (red), and 2017 (blue). The phases indicated on the right are based on the rotation period of 51.7 d determined in Sect. 3. Right: dynamical spectrum for the He I 10 830 Å triplet. It is constructed using differences between individual He profiles and the profile observed at the rotation phase 0.44 showing the least complex structure.