Fig. 8.
Left panel: Ca II K line. A transient event is seen at ∼20 km s−1, which is superimposed on the red wing of the narrow non-photospheric absorption at ∼15 km s−1. No obvious event is seen on March 8, 2017. Right panel: Na I D2 line. Dates are as indicated and all spectra were obtained using HERMES. The red and grey vertical lines mark the radial velocity of the star and of the ISM, respectively.
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