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A Spectroscopic Study of a Large Sample of Wolf-Rayet Galaxies
N. G. Guseva, Y. I. Izotov, T. X. Thuan
We analyze long-slit spectral observations of 39 Wolf-Rayet (WR) galaxies with heavy element mass fraction ranging over 2 orders of magnitude, from Zsun/50 to 2Zsun. Nearly all gal…
Helium abundance in the most metal-deficient blue compact galaxies: I Zw 18 and SBS 0335-052
Y. I. Izotov, F. H. Chaffee, C. B. Foltz +3
We present high-quality spectroscopic observations of the two most-metal deficient blue compact galaxies known, I Zw 18 and SBS 0335-052 to determine the helium abundance. The unde…
Is I Zw 18 a young galaxy?
Y. I. Izotov, P. Papaderos, T. X. Thuan +3
Hubble Space Telescope (HST) colour - magnitude diagrams in B, V and R along with long-slit Multiple Mirror Telescope (MMT) spectrophotometric data are used to investigate the evol…
The young age of the extremely metal-deficient blue compact dwarf galaxy SBS 1415+437
T. X. Thuan, Y. I. Izotov, C. B. Foltz
We use Multiple Mirror Telescope (MMT) spectrophotometry and Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra and Wide Field and Planetary Camera 2 (WFPC2) V an…
Young Dwarf Galaxies and Cosmology
T. X. Thuan, Y. I. Izotov
We develop here the theme that extremely metal-deficient Blue Compact Dwarf Galaxies (BCDs), those with Z < Zsun/20, are young galaxies which did not start to form stars until ~ 10…
SBS 0335-052W - an Extremely Low Metallicity Dwarf Galaxy
V. A. Lipovetsky, F. H. Chaffee, Y. I. Izotov +3
We present Multiple Mirror Telescope (MMT) and Keck II telescope spectrophotometry and 3.5m Calar Alto telescope R, I photometry of the western component of the extremely low-metal…