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Abundance patterns in the low-metallicity emission-line galaxies from the Early Data Release of the Sloan Digital Sky Survey
Y. I. Izotov, G. Stasinska, N. G. Guseva +1
We have derived element abundances in 310 emission-line galaxies from the Early Data Release of the Sloan Digital Sky Survey (SDSS) for which the [O {\sc iii}] 4363 emission line w…
Systematic effects and a new determination of the primordial abundance of 4He and dY/dZ from observations of blue compact galaxies
Y. I. Izotov, T. X. Thuan
We use spectroscopic observations of a sample of 82 HII regions in 76 blue compact galaxies to determine the primordial helium abundance Yp and the slope dY/dZ from the Y-O/H linea…
Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies. III. SBS 1415+437
N. G. Guseva, P. Papaderos, Y. I. Izotov +4
We present a detailed optical spectroscopic and B,V,I,Halpha photometric study of the metal-deficient cometary blue compact dwarf (BCD) galaxy SBS 1415+437. We derive an oxygen abu…
Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies. II. HS 1442+4250
N. G. Guseva, P. Papaderos, Y. I. Izotov +4
We present broad-band V and I imaging and long-slit spectroscopy in the optical range 3600-7500A of the dwarf irregular galaxy HS 1442+4250. The oxygen abundance 12+log(O/H)=7.63+/…
Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies. I. SBS 1129+576
N. G. Guseva, P. Papaderos, Y. I. Izotov +4
Spectroscopy and V,I CCD photometry of the dwarf irregular galaxy SBS 1129+576 are presented for the first time. The CCD images reveal a chain of compact H II regions within the el…
New Light on the Stellar Populations in IZw18: Deep Near-Infrared Imaging
Leslie K. Hunt, Trinh X. Thuan, Yuri I. Izotov
We present deep JHK images of IZw18, the most metal-deficient Blue Compact Dwarf galaxy known, and analyze them in conjunction with archival HST/WFPC2 optical images. To investigat…