Spectroscopic log T_eff vs. log g_Hip for the candidate stars. We have employed the Yonsei-Yale isochrones (Demarque et al. 2004) for Z = 0.0 and age = 0.1, 0.3, 0.5, 1, 4, and 13 Gyr (from left to right). Mean error bars are represented in the middle right. Blue squares represent stars selected as members by the chemical tagging approach; red diamonds represent those stars that have similar Fe abundances, but different values of other elements. The orange circle represents the reference star HD 115043. Inverted green triangles represent those stars that do not have similar Fe abundances (as well as dissimilar values of other elements). For the membership criterion we refer the reader to Sect. 5.