Lithium abundances for 1000 PTPS stars

Within the PennStateToruń Planet Search we monitor a sample of ∼1000 stars at various stages of evolution with the Hobby-Eberly Telescope. The main goal of the project is a search for low-mass companions with the radial velocity measurements technique, an indepth study of planetary systems evolution and detailed analysis of evolution-induced starplanet interactions. So far, we have identified about 200 planetary candidates and about100 new multiple stars. We present here a ⁷Li abundance analysis for all observed stars which resulted in detection of 18 Li-overabundant giants, including the super Li-rich star with A(Li)=4.59 (where A(Li)=log n_Li=n_H + 12). We present preliminary results of our A(Li) investigations. Global behavior of lithium abundances for stars in our sample reflects lithium abundance evolution from the Main Sequence to the Red Giant Branch.We also report a few newly discovered lithium overabundant giants showing periodic changes in radial velocities. For one of them the observed lithium enrichment might possibly be explained by a recent planet engulfment episode.