The hot horizontal-branch stars in ω Centauri S. Moehler, S. Dreizler, T. Lanz, G. Bono, A. V. Sweigart, A. Calamida and M. Nonino A&A, 526 (2011) A136 Published online: 12 January 2011 DOI: 10.1051/0004-6361/201015020