Merging in the common envelope and the origin of early R-type stars L. Piersanti, R. M. Cabezón, O. Zamora, I. Domínguez, D. García-Senz, C. Abia and O. Straniero A&A, 522 (2010) A80 Published online: 04 November 2010 DOI: 10.1051/0004-6361/201014046