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Context. Elemental abundances are of prime importance to help us reconstructthe origin and evolution of stars and galaxies in our Universe. Sulfurabundances have not been as heavily studied as other elements, so some detailsregarding its behaviour are still unclear. Aims. We aim to investigate [S/Fe]ratios in stars of the solar neighbourhood in order to analyse the chemicalevolution of sulfur and probe for possible differences in abundances of planethost and non-planet host stars. Methods. We use the code MOOG to performspectral synthesis and derive v*sin(i) values and [S/Fe] ratios for 719 FGKstars with high-resolution (R~115000) and high-quality spectra from theHARPS-GTO program. We find the best fit and corresponding parameter values byperforming chi-square minimisation of the deviation between synthetic profilesand observational spectra. Results. Our results reveal that sulfur behaves as atypical alpha-element, with low abundances in young thin disk stars and highabundances in old thick disk stars, following what was expected from ourunderstanding of the Galactic chemical evolution (GCE). Nevertheless, furtherstudies into the abundances of sulfur in very metal-poor stars are required asour sample only derived sulfur abundances to stars with metallicity as low as[Fe/H]=-1.13 dex. High-alpha metal rich stars are more enhanced in sulfurcompared to their thin disk counterparts at the same metallicity. We compareour results to GCE models from other authors in the [S/Fe] vs. [Fe/H] plane.The [S/Fe]-age relationship is a good proxy for time, just like it is the casewith other alpha-elements. We report no differences in the abundances of sulfurbetween stars with and without planetary companions in the metallicity range[Fe/H] >= -0.3 dex.

Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur