Accretion of chemically fractionated material on a wide binary with a blue straggler S. Desidera, R. G. Gratton, S. Lucatello, M. Endl and S. Udry A&A, 462 3 (2007) 1039-1049 Published online: 13 November 2006 DOI: 10.1051/0004-6361:20066150