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Fig. 4

image

Equivalent width of the Hα emission line measured on spectra collected with the HEROS spectrograph and corrected for the phase-locked variations of the continuum level. The data are shown as a function of orbital phase of the eclipsing binary (top panel, computed with the quadratic ephemerides, Eq. (2)) and as a function of date (bottom panel). Different symbols stand for different observing campaigns: crosses, open squares, filled triangles, filled circles and stars indicate data collected in 2015, 2016, 2017, 2018 and 2019, respectively.

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