Oxygen abundance variations in the system of the two blue compact dwarf galaxies SBS 0335-052E and SBS 0335-052W
Institute for Astrophysics, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany e-mail: email@example.com
2 Main Astronomical Observatory, Ukrainian National Academy of Sciences, Zabolotnoho 27, Kyiv 03680, Ukraine
3 Astronomy Department, University of Virginia, Charlottesville, VA 22903, USA
Accepted: 16 March 2006
We present 3.6 m ESO telescope spectroscopic observations of the system of the two blue compact dwarf galaxies SBS 0335-052 W and SBS 0335-052 E. The oxygen abundance in SBS 0335-052W is , confirming that this galaxy is the most metal-deficient emission-line galaxy known. We find that the oxygen abundance in SBS 0335-052E varies from region to region in the range from 7.20 to 7.31, suggesting the presence of an abundance gradient over a spatial scale of 1 kpc. Signatures of early carbon-type Wolf-Rayet stars are detected in cluster #3 of SBS 0335-052 E, corresponding to the emission of 20 to 130 WC4 stars, depending on the adopted luminosity of a single WC4 star in the C iv λ4658 emission line.
Key words: galaxies: fundamental parameters / galaxies: starburst / galaxies: abundances
© ESO, 2006