An abundance study of red-giant-branch stars in the Hercules dwarf spheroidal galaxy D. Adén, K. Eriksson, S. Feltzing, E. K. Grebel, A. Koch and M. I. Wilkinson A&A, 525 (2011) A153 Published online: 10 December 2010 DOI: 10.1051/0004-6361/201014963