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Fig. 3


Intrinsic RV scatter observed in our sample of 373 K giants versus BV color. A clear trend is visible in the sense that redder stars without companions (circles) have larger intrinsic RV variations. A number of stars lie above the almost linear relation between color and the logarithm of the scatter. These stars have clearly periodic RVs, which indicates that they harbor substellar or stellar companions. Stars with non-periodic, but still systematic radial velocities are indicated with green crosses. The RV scatter of ~15 m s-1, for η Cet (red star) derived as the rms around the orbital fit, is lower than the 25 m s-1 derived from the linear trend at the star’s color index.

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