Enrichment of the Galactic Disk by the Neutron Capture Elements (Ba and Eu)
2006
The abundances of Ba and Eu were determined for 38 red giant stars in the metallicity range -0.6<[Fe/H]<+0.25 using the spectral synthesis technique. The spectra were obtained with spectrograph ELODIE (Haute Provence Observatoire, France), the resolwing power is 42000, S/N is more than 100. For the Ba and Eu lines the effects of hyperfine structure and isotope shifts are included, assuming the isotope ratios of the r-process component of the solar system material. Abundances of the n-capture element (Ba and Eu) for 38 red giants with metallicities [Fe/H] from -0.6 to +0.25 and correlation of the [Ba/Eu] ratios with stellar metallicities are present. The [Ba/Eu] ratio reflects substantial production of Ba in the s-process for the stars with metallicity -0.6<[Fe/H]<+0.25.
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