I present some preliminary results from a high-resolution spectroscopic observing campaign conducted with UVES ( Ultraviolet Visual Echelle Spectrograph ) at the ESO VLT ( Very Large Telescope ) , devoted to the study of the newly discovered , metal-rich red giant branch in \omega Centauri ( the RGB-a ) .
In particular , I derive and discuss accurate abundances of iron-peak elements , \alpha -elements and s -process elements .
The main results discussed in this contribution are : ( i ) the RGB-a is the most metal-rich component of the RGB stellar mix in \omega Cen , with [ Fe/H ] = -0.62 \pm 0.06 ; ( ii ) the RGB-a has a lower \alpha -enhancement compared to the other red giants , possibly due to SNe type Ia pollution and ( iii ) the s -process elements overabundance of the RGB-a is similar to that of the other red giants in \omega Cen , and unusually high for globular cluster stars , due to pollution by low mass Asymptotic Giant Branch ( AGB ) stars .