Evolved stars suggest an external origin of the enhanced metallicity in planet-hosting stars L. Pasquini, M. P. Döllinger, A. Weiss, L. Girardi, C. Chavero, A. P. Hatzes, L. da Silva and J. Setiawan A&A, 473 3 (2007) 979-982 Published online: 30 July 2007 DOI: 10.1051/0004-6361:20077814