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Aims. We investigate evidence of accretion in a sample of 15 Herbig Ae/Be stars to determine whether these events originate in a remnant gaseous structure from the primordial cloud (rich in hydrogen) or in a metal-rich body (like comets in our Solar System). During such analysis we also determine precise stellar parameters for this sample of stars. Methods. The stars were observed using high resolution spectroscopy (R = 48 000). A synthetic photospheric spectrum was constructed and thendoi:10.1051/0004-6361:20065005 fatcat:hribkejyzjcglejfe6oasildwy