A VIMOS spectroscopy study of photometric variables and straggler candidates in ω Centauri M. Rozyczka, J. Kaluzny, P. Pietrukowicz, W. Pych, M. Catelan and C. Contreras A&A, 537 (2012) A89 Published online: 12 January 2012 DOI: 10.1051/0004-6361/201117668