C and N abundances of main sequence and subgiant branch stars in NGC 1851 C. Lardo, A. P. Milone, A. F. Marino, A. Mucciarelli, E. Pancino, M. Zoccali, M. Rejkuba, R. Carrera and O. Gonzalez A&A, 541 (2012) A141 Published online: 16 May 2012 DOI: 10.1051/0004-6361/201118763