Binary fraction as a function of their evolutionary states. Pentagons mark stars that undergo core-degeneration on the RGB (M/M_⊙ ≤ 1.8), while star symbols indicate the binary fraction for stars that will ignite He under non-degenerate conditions (M/M_⊙ > 1.8). The style of the connecting lines depicts the significance of the variations as discussed in the text and specified in Table 2. The yellow bar indicates the binary fraction among MS stars without oscillations. The marker color depicts the evolutionary state as indicated on the horizontal axis.