The hottest horizontal-branch stars in Centauri. Late hot flasher vs. helium enrichmentS. Moehler, S. Dreizler, T. Lanz, G. Bono, A. V. Sweigart, A. Calamida, M. Monelli and M. NoninoA&A, 475 2 (2007) L5-L8DOI: https://doi.org/10.1051/0004-6361:20078509