After hydrogen and helium, oxygen, carbon, and nitrogen—hereinafter, the CNO elements—
are the most abundant species in the universe. They are observed in all kinds of …

Metallicity is a key parameter that controls many aspects in the formation and evolution of
stars and galaxies. In this review we focus on the metal deficient galaxies, in particular the …

Simple relations for deriving the oxygen abundance in H ii regions with intensities of the
three strong emission lines R 2, R 3, and N 2 (R calibration) or S 2, R 3, and N 2 (S …

We have re-evaluated empirical expressions for the abundance determination of N, O, Ne,
S, Cl, Ar and Fe taking into account the latest atomic data and constructing an appropriate …

We present high-quality ground-based spectroscopic observations of 54 supergiant H II
regions in 50 low-metallicity blue compact galaxies with oxygen abundances 12+ …

Many of the results in modern astrophysics rest on the notion that the initial mass function
(IMF) is universal. Our observations of a sample of H i selected galaxies in the light of Hα …

We present a long-slit optical spectrophotometric survey covering 0.05 kpc 2 in the nearby
irregular" post-starburst" galaxy NGC 1569 to search for chemical gradients and …

Heavy element abundances in a new sample of low-metallicity blue compact galaxie ADS
Classic is now deprecated. It will be completely retired in October 2019. This page will …

We present the first results of an ongoing project to investigate the present-day chemical
abundances of the extreme outer parts of galactic disks, as probed by the emission-line …

We study the effect of a single, instantaneous starburst on the dynamical and chemical
evolution of a gas-rich dwarf galaxy, the potential well of which is dominated by a dark …