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We performed a uniform and detailed abundance analysis of 12 refractoryelements (Na, Mg, Al, Si, Ca, Ti, Cr, Ni, Co, Sc, Mn and V) for a sample of1111 FGK dwarf stars from the HARPS GTO planet search program. 109 of thesestars are known to harbour giant planetary companions and 26 stars are hostingexclusively Neptunians and super-Earths. The main goals of this paper are i) toinvestigate whether there are any differences between the elemental abundancetrends for stars of different stellar populations; ii) to characterise theplanet host and non-host samples in term of their [X/H]. The extensive study ofthis sample, focused on the abundance differences between stars with andwithout planets will be presented in a parallel paper. The equivalent widths ofspectral lines are automatically measured from HARPS spectra with the AREScode. The abundances of the chemical elements are determined using a LTEabundance analysis relative to the Sun, with the 2010 revised version of thespectral synthesis code MOOG and a grid of Kurucz ATLAS9 atmospheres. Toseparate the Galactic stellar populations we applied both a purely kinematicalapproach and a chemical method. We found that the chemically separated (basedon the Mg, Si, and Ti abundances) thin and thick discs are also chemicallydisjunct for Al, Sc, Co and Ca. Some bifurcation might also exist for Na, V,Ni, and Mn, but there is no clear boundary of their [X/Fe] ratios. We confirmthat an overabundance in giant-planet host stars is clear for all the studiedelements.We also confirm that stars hosting only Neptunian-like planets may beeasier to detect around stars with similar metallicities as non-planet hosts,although for some elements (particulary alpha-elements) the lower limit of[X/H] are very abrupt.

Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets