Fig. 3
HD 172555 spectra of 2004 in the Ca II K line (top panel) and H line (bottom panel). Two typical spectra on 22 September 2004 separated by a 6 min-time interval (red lines) clearly show the presence of an additional absorption at the star’s radial velocity in comparison to spectra obtained 100 days earlier (black lines). Velocities are given in the star’s rest frame.
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