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 AMR 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 \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 bieng part of the abundance catalogue .