THE AGE-MASS RELATION FOR CHROMOSPHERICALLY ACTIVE BINARIES - III - LITHIUM DEPLETION IN GIANT COMPONENTS

We present a study of the lithium abundances of a sample of evolved co mponents of Chromospherically Active Binary Systems. We show that a si gnificant part of them have lithium excesses, independently of their m ass and evolutionary stage. Therefore, it can be concluded that Li abu ndance does not depend on age for giant components of CABS. These over abundances appear to be closely related to the stellar rotation, and w e interpret them as a consequence of the transfer of angular momentum from the orbit to the rotation as the stars evolve: in and off the Mai n Sequence, in a similar way as it happens in the dwarf components of the same systems and in the Tidally Locked Binaries belonging to the H yades and M67.