Open Access

Fig. 15

image

Top panel: 70 observed Hα profiles of o Aquarii from the BeSS database, covering about 17 yr of observations (2001–2018). Bottom panel: Hα equivalent width as a function of the observation time (modified Julian date). Civil dates are indicated for a part of the measured EW. The mean EW (solid) within the standard deviation (dashed lines) is marked in black. Local regression fit of EW, as a function of time, is shown as a solid red line. The time interval covered by our interferometric observations (VEGA) is indicated with dashed red lines. See text for discussion.

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