EDP Sciences
Free access
Issue
A&A
Volume 389, Number 3, July III 2002
Page(s) 779 - 786
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20020683


A&A 389, 779-786 (2002)
DOI: 10.1051/0004-6361:20020683

The metallicities of UM 151, UM 408 and A 1228+12 revisited

S. A. Pustilnik1, 2, A. Y. Kniazev1, 3, 2, J. Masegosa4, I. Márquez4, A. G. Pramskij1, 2 and A. V. Ugryumov1, 2

1  Special Astrophysical Observatory RAS, Nizhnij Arkhyz, Karachai-Circassia, 369167 Russia
2  Isaac Newton Institute of Chile, SAO Branch
3  Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
4  Instituto de Astrofísica de Andalucía, Granada, Spain

(Received 5 December 2001 / Accepted 16 April 2002)

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 $\rm log(O/H)+12 \le$ 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: $\rm log(O/H)+12 =$ 8.5 and 7.93, respectively. For A 1228+12 our new 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 $Z \lesssim 1/20~Z$ $_{\odot}$.


Key words: galaxies: dwarf -- galaxies: stellar content -- galaxies: abundances -- galaxies: individual: UM 151=Mkn 1169, UM 408, A 1228+12=RMB 132

Offprint request: S. Pustilnik, sap@sao.ru

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