Activity level as a function of the rotation period, P_rot. The RGB and RC stars are represented in red and green, respectively, while RGs with an unidentified evolutionary stage are in blue. Black symbols correspond to non-oscillating RGs in close binaries from Gehan et al. (2022). Triangles and diamonds represent wide (P_orb > 150 d) and close (P_orb ≤ 150 d) binaries identified by Gaia DR3, respectively. The gray background indicates the distribution of the activity level for inactive stars, where a darker shade corresponds to a larger number of stars. Upper left: Δm_NUV. Upper right: S_{Ca II H&K}. Lower left: S​_Hα. Lower right: S_Ca II IR.