Position of the SB9 binary systems (Pourbaix et al. 2004) in the e–P plane. Magenta and blue dots indicate all systems found through the photometric calibration described in Sect. 2 and Fig. 1 to host a primary in an advanced stellar evolutionary phase and on the main sequence, respectively. Systems from the published Kepler sample with an oscillating RG primary are depicted as black triangles. Systems hosting two oscillating RG components (PB2) are shown as grey diamonds.