Metallicity of low-mass stars in Orion V. D'Orazi, S. Randich, E. Flaccomio, F. Palla, G. G. Sacco and R. Pallavicini A&A, 501 3 (2009) 973-983 Published online: 13 May 2009 DOI: 10.1051/0004-6361/200811241