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Astronomy & Astrophysics manuscript no. (will be inserted by hand later) The metallicities of UM 151, UM 408 and A 1228+12 revisited

By S. A. Pustilnik, A. Y. Kniazev, J. Masegosa, I. Márquez, A. G. Pramsky and A. V. Ugryumov


Abstract. We present the results of new spectrophotometry and heavy element abundance determinations for 3 dwarf galaxies UM 151, UM 408 and A 1228+12 (RMB 132). These galaxies have been claimed in the literature to have very low metallicities, corresponding to log(O/H) + 12 ≤ 7.65, that are in the metallicity range of some candidate local young galaxies. We present higher S/N data for these three galaxies. UM 151 and UM 408 have significantly larger metallicities: log(O/H)+12 = 8.5 and 7.93, respectively. For A 1228+12 our new log(O/H)+ 12 =7.73 is close to that recalculated from earlier data (7.68). Thus, the rederived metallicities allow us to remove these objects from the list of galaxies with Z � 1/20 Z⊙

Year: 2001
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