Barium stars 12C, 13C, N, and O abundances

As a consequence, their envelopes were enriched with material synthesized in the interiors of their evolved companions via slow neutron-capture nucleosynthesis, the s-process. As postinteracting binaries, Ba stars figure as powerful tracers of the s-process.

In this study, we conduct a classical local thermodynamic equilibrium analysis for a sample of 180 Ba giant stars to find complementary insights for the s-process, in form of elemental abundances of carbon, nitrogen, and oxygen, as well as the ^12^C/^13^C ratio. We found carbon abundances systematically larger than those observed in normal giants, with [C/Fe] ratios ranging within from -0.30 to +0.60dex. As expected, the [C/Fe] ratios increase for lower metallicity regimes and are strongly correlated with the average s-process abundances.