Upper: linearly detrended CoRoT light curve of HD 46769 phased with respect to the frequency f = 0.0516  d^-1. The grey thick full line is a harmonic fit with f and seven of its harmonics, of which 4f = 0.2064  d^-1 is the dominant frequency in the light curve. The red symbols and red line denote averages over 101 consecutive data points and a fit to that binned light curve respectively. Middle and bottom: equivalent width and radial velocity of the Mg ii 4481 Å line as observed in the HERMES (circles) and HARPS (plus signs) spectra.