The Hamburg/ESO R-process enhanced star survey (HERES): II. Spectroscopic analysis of the survey sample - Barklem, P.S; Chistlieb, N; Beers, T. C; Hill, V; Bessell, M.S.; Holmberg, J; Marsteller, B; Rossi, Silvia Cristina Fernandes; Zickgraf, F. -J; Reimers, D (Astronomy and Astrophysics, 2005)