Chemical enrichment mechanisms in ω Centauri: clues from neutron-capture elements V. D’Orazi, R. G. Gratton, E. Pancino, A. Bragaglia, E. Carretta, S. Lucatello and C. Sneden A&A, 534 (2011) A29 Published online: 26 September 2011 DOI: 10.1051/0004-6361/201117630