212 citations · 290 across the 2 of their papers we have counts for
15 papers · 1 filter
The primordial abundance of 4He: a self-consistent empirical analysis of systematic effects in a large sample of low-metallicity HII regions
Y. I. Izotov, T. X. Thuan, G. Stasinska
We determine the primordial helium mass fraction Yp using 93 spectra of 86 low-metallicity extragalactic HII regions. This sample constitutes the largest and most homogeneous high-…
On the maximum value of the cosmic abundance of oxygen and the oxygen yield
L. S. Pilyugin, T. X. Thuan, J. M. Vilchez
We search for the maximum oxygen abundance in spiral galaxies. Because this maximum value is expected to occur in the centers of the most luminous galaxies, we have constructed the…
Optical & NIR Surface Photometry of I Zw 18
P. Papaderos, Yu. I. Izotov, K. G. Noeske +2
Using HST and ground-based optical and NIR data, we investigate whether the blue compact dwarf (BCD) galaxy I Zw 18 has an extended low-surface-brightness (LSB) older stellar popul…
FUSE observations of the Blue Compact Dwarf Galaxy Mrk 59
T. X. Thuan, A. Lecavelier des Etangs, Y. I. Izotov
New FUSE far-UV spectroscopy of the nearby metal-deficient (Zsun/8) cometary Blue Compact Dwarf (BCD) galaxy Markarian (Mrk) 59 is discussed. The data are used to investigate eleme…
The gaseous content of the Blue Compact Galaxy Mrk 59
A. Lecavelier des Etangs, T. X. Thuan, Y. I. Izotov
FUSE far-UV spectroscopy of the nearby metal-deficient (Zo/8) cometary Blue Compact Dwarf galaxy Mrk59 have been used to investigate element abundances in its interstellar medium.…
Big Bang nucleosynthesis and the baryonic content of the universe
T. X. Thuan, Y. I. Izotov
A review of the latest measurements of the primordial abundances of the light nuclei D, 3He, 4He and 7Li is given. We discuss in particular the primordial abundance Yp of 4He as me…