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Oxygen Abundance and Stellar Populations in the Three Most Metal-Deficient Emission-Line Galaxies Known in the Local Universe: SBS 0335-052,E, SBS 0335-052 W and I Zw 18

Published online by Cambridge University Press:  01 August 2006

P. Papaderos ,
T. Yakobchuk ,
Y. I. Izotov ,
N. G. Guseva  and
K. J. Fricke
P. Papaderos
Affiliation:
Institute for Astrophysics, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
T. Yakobchuk
Affiliation:
Main Astronomical Observatory, Zabolotnoho 27, Kyiv 03680, Ukraine
Y. I. Izotov
Affiliation:
Main Astronomical Observatory, Zabolotnoho 27, Kyiv 03680, Ukraine
N. G. Guseva
Affiliation:
Main Astronomical Observatory, Zabolotnoho 27, Kyiv 03680, Ukraine
K. J. Fricke
Affiliation:
Institute for Astrophysics, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
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We present new spectroscopic observations of the system of the two blue compact dwarf (BCD) galaxies SBS 0335-052 W and SBS 0335-052 E with the 3.6m ESO telescope. The oxygen abundance in SBS 0335-052 W was determined to be 12 + log(O/H) = 7.13±0.08, confirming that this galaxy is the most metal-deficient emission-line galaxy known. We find that the oxygen abundance in SBS 0335-052 E 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 Civ λ4658 emission line (Papaderos et al. 2006).

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 326
Copyright
Copyright © International Astronomical Union 2007