Analysis of cool DO-type white dwarfs from the Sloan Digital Sky Survey data release 10 N. Reindl, T. Rauch, K. Werner, S. O. Kepler, B. T. Gänsicke and N. P. Gentile Fusillo A&A, 572 (2014) A117 Published online: 08 December 2014 DOI: 10.1051/0004-6361/201424861