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Open clusters are key tools to study the spatial distribution of abundancesin the disk and their evolution with time. Using the first release of stellarparameters and abundances of the Gaia-ESO Survey, we analyse the chemicalproperties of stars in three old/intermediate-age open clusters, namely NGC6705, NGC 4815, and Trumpler 20, all located in the inner part of the Galacticdisk at Galactocentric radius R$_{GC}\sim$7 kpc, aiming at proving theirhomogeneity and at comparing them with the field population. We study theabundance ratios of elements belonging to two different nucleosyntheticchannels: $\alpha$-elements and iron-peak elements. The main results can besummarised as follows: i) cluster members are chemically homogeneous within3-$\sigma$ in all analysed elements; ii) the three clusters have comparable[El/Fe] patters within $\sim$1-$\sigma$, but they differ in their global metalcontent [El/H], with NGC 4815 having the lowest metallicity. Their [El/Fe]ratios show differences and analogies with those of the field population, bothin the solar neighbourhood and in the bulge/inner disk; iii) comparing theabundance ratios with the results of two chemical evolution models and withfield star abundance distributions, we find that the abundance ratios of Mg,Ni, Ca in NGC 6705 might require an inner birthplace, implying a subsequentvariation of its R$_{GC}$ during its lifetime, consistent with previous orbitdetermination. The full dataset of the Gaia-ESO Survey will be a superlativetool to constrain the chemical evolution of our Galaxy by disentanglingdifferent formation and evolution scenarios.

The Gaia-ESO Survey: Abundance ratios in the inner-disk open clusters Trumpler 20, NGC 4815, NGC 6705