Membership, rotation, and lithium abundances in the open clusters NGC 2451 A and B M. Hünsch, S. Randich, M. Hempel, C. Weidner and J. H. M. M. Schmitt A&A, 418 2 (2004) 539-549 Published online: 09 April 2004 DOI: 10.1051/0004-6361:20040043