Context : We present a detailed analysis of 26 barium stars , including dwarf barium stars , providing their atmospheric parameters ( T _ { eff } , log g , [ Fe/H ] , v _ { t } ) and elemental abundances .

Aims : We aim at deriving gravities and luminosity classes of the sample stars , in particular to confirm the existence of dwarf barium stars .
Accurate abundances of chemical elements were derived .
Abundance ratios between nucleosynthetic processes , by using Eu and Ba as representatives of the r- and s-processes are presented .

Methods : High-resolution spectra with the FEROS spectrograph at the ESO-1.5m Telescope , and photometric data with Fotrap at the Zeiss telescope at the LNA were obtained .
The atmospheric parameters were derived in an iterative way , with temperatures obtained from colour-temperature calibrations .
The abundances were derived using spectrum synthesis for Li , Na , Al , \alpha - , iron peak , s- and r-elements atomic lines , and C and N molecular lines .

Results : Atmospheric parameters in the range 4300 < T _ { eff } < 6500 , -1.2 < [ Fe/H ] < 0.0 and 1.4 \leq log g < 4.6 were derived , confirming that our sample contains giants , subgiants and dwarfs .
The abundance results obtained for Li , Al , Na , \alpha - and iron peak elements for the sample stars show that they are compatible with the values found in the literature for normal disk stars in the same range of metallicities .
Enhancements of C , N and heavy elements relative to Fe , that characterise barium stars , were derived and showed that [ X/Ba ] vs. [ Ba/H ] and [ X/Ba ] vs. [ Fe/H ] present different behaviour as compared to [ X/Eu ] vs. [ Eu/H ] and [ X/Eu ] vs. [ Fe/H ] , reflecting the different nucleosynthetic sites for the s- and r-processes .

Conclusions :