Lithium and chromospherically active single giants

Nine chromospherically active single K giants have been identified from several surveys of chromospherically active stars. Such large velocities are not explained by current scenarios of main sequence to giant star evolution. Fluxes of the ultraviolet emission lines of these stars are substantially less than those of FK Comae. Many of these giants have a moderate or strong lithium line strongly suggesting that these stars have just recently evolved from rapidly rotating A or early F stars as is suggested by their space motions. Thus, they are not spun down FK Com stars. The characteristics of these stars are such that they may be confused with pre-main-sequence stars. The primary difference may be that the post main sequence stars have strong Hα absorption lines while the pre-main sequence stars appear to have a weak Hα absorption line or possibly Hα in emission above the continuum