  We present the results of our investigation of three samples kinematically
representative of the thin and thick disks and the Hercules stream using the
catalogue of Soubiran & Girard (2005). We have observed abundance trends and
age distribution of each component. Our results show that the two disks are
chemically well separated, they overlap greatly in metallicity and both show
parallel decreasing trends of alpha elements with increasing metallicity, in
the interval -0.80 < [Fe/H] < -0.30. The thick disk is clearly older than the
thin disk with a tentative evidence of an Age-Metallicity Relation over 2-3 Gyr
and a hiatus in star formation before the formation of the thin disk. In order
to improve the statistics on the disk's abundance trends, we have developed an
automatic code, TGMET{\Large\alpha}; to determine (Teff, logg, [Fe/H],
[\alpha/Fe]) for thousands of stellar spectra available in spectroscopic
archives. We have assessed the performances of the algorithm for 350 spectra of
stars being part of the abundance catalogue.
