I present preliminary results for a sample of \sim 700 red giants in \omega Cen , observed during the Ital-FLAMES Consortium GTO time in May 2003 , for the Bologna Project on \omega Cen .
Preliminary Fe and Ca abundances confirm previous results : while the metal-poor and intermediate populations show a normal halo \alpha -enhancement of [ \alpha /Fe ] \simeq +0.3 , the most metal-rich stars show a significantly lower [ \alpha /Fe ] \simeq +0.1 .
If the metal-rich stars have evolved within the cluster in a process of self-enrichment , the only way to lower their \alpha -enhancement would be SNe type Ia intervention .