  We present the chemical analysis of a new set of stars known to harbor low
mass companions, namely HD 1237, HD 52265, HD 82943, HD 83443, HD 169830, and
HD 202206. In addition, we have also analyzed HD 13445 and HD 7528}, already
studied elsewhere. The abundances of C and alpha-elements O, S, Si, Ca and Ti
are presented and discussed in the context of the metallicity distribution of
the stars with extra-solar planets. We compare the metallicity distribution of
stars with planets with the same distribution of field dwarfs. The results
further confirm that stars with planets are over-abundant in [Fe/H].
