Several studies are reviewed to illustrate the possibilities of cross-correlation spectroscopy to derive rotational velocities, macroturbulence, metallicities, magnetic fields and information on oscillation modes.
The validity of radial-velocities of SB2 systems derived from the cross-correlation device has sometimes been criticized. The total absence of any basis to this criticism can easily be demonstrated. Indeed, this method is well suited to the study of SB2 with low radial velocity amplitudes, as for example, visual binaries.
Finally, as a result of different radial-velocity surveys carried out with CORAVEL, the eccentricity-period relations are discussed, showing the concurrent influence of the tidal circularization, circularization by mass-exchange and the dependence of the initial eccentricity distribution with the orbital period.