Comparison of the CA of host stars with the CA of MS and evolved stars. Top panel: distribution of the MS-field stars with ∆M_V ≤ 0.45 above the average HIPPARCOS MS (cyano small filled circles) and the transiting planet hosts (left). In the plot, we also indicated two representations of the activity basal limit for MS stars. The black dashed line is the generally considered constant limit. The blue dashed line is the polynomial model of the basal level (Mittag et al. 2013). The comparison of the normalized histograms and the cumulative distribution functions of the two distributions in the left panel (right). Bottom panel: evolved field stars with 0.45 ≤ ∆M_V ≤ 2.00 above the average Hypparcos MS (small filled green circles) and the transiting planet hosts (of both samples) are on the left. A comparison of the normalized histograms and the cumulative distribution functions of the two distributions in the left panel is on the right.