A Spectroscopic Study of Barium Stars

We present an analysis of eight barium stars, providing their atmospheric parameters (T-eff, log g, [Fe/H], xi(t)) and chemical abundances, based on the high signal-to-noise ratio and high resolution Echelle spectra. The s-process elements Y, Zr, Ba, La, Eu show obvious overabundance relative to the San. And Na, Mg, Al, Si, Ca, Sc, Ti V, Cr, Mn, Ni show comparable abundances to the Solar ones. The results of theoretical model of wind accretion for binary systems can explain the observed abundance patterns of the neutron capture process elements in these Ba stars, which means that their overabundant heavy-elements could be caused by accreting the ejecta of AGB stars, the progenitors of the present white dwarf companions in the binary systems.