We derived the barium atmospheric abundances for a large sample of Cepheids, comprising 270 stars. The sample covers a large range of galactocentric distances, from about 4 to 15 kpc, so that it is appropriated to investigate the existence of radial barium abundance gradients in the galactic disc. In fact, this is the first time that such a comprehensive analysis of the distribution of barium abundances in the galactic disc is carried out. As a result, we conclude that the Ba abundance distribution can be characterized by a zero gradient. This result is compared with derived gradients for other elements, and some reasons are briefly discussed for the independence of the barium abundances upon galactocentric distances.
Cite
@article{arxiv.1210.6211,
title = {Barium Abundances in Cepheids},
author = {S. M. Andrievsky and J. R. D. Lepine and S. A. Korotin and R. E. Luck and V. V. Kovtyukh and W. J. Maciel},
journal= {arXiv preprint arXiv:1210.6211},
year = {2015}
}