316 citations · 2.6k across the 57 of their papers we have counts for
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The Oxygen Abundance of Nearby Galaxies from Sloan Digital Sky Survey Spectra
L. S. Pilyugin, T. X. Thuan
We have derived the oxygen abundance for a sample of nearby galaxies in the Data Release 5 of the Sloan Digital Sky Survey (SDSS) which possess at least two independent spectra of…
The metallicity extremes of the Sagittarius dSph using SALT spectroscopy of PNe
A. Kniazev, A. Zijlstra, E. Grebel +10
In this work we present the first spectroscopic results obtained with the Southern African Large Telescope (SALT) telescope during its perfomance-verification phase. We find that t…
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…
On the electron temperature determination in high-metallicity HII regions
L. S. Pilyugin
The problem of determination of the electron temperature t_2 in the OII zone of high-metallicity HII region was examined. It was shown that the ratio of nebular to auroral nitrogen…
On the relation between electron temperatures in the O+ and O++ zones in high-metallicity HII regions
L. S. Pilyugin, J. M. Vilchez, T. X. Thuan
We suggest a new way to establish the relation between the electron temperature t3 within the [OIII] zone and the electron temperature t2 within the [OII] zone in high-metallicity…
On the relationship between auroral and nebular oxygen line intensities in spectra of HII regions
L. S. Pilyugin
We investigate relationships between observed auroral and nebular oxygen line fluxes in spectra of HII regions. We find a relation that is metallicity-dependent at low metallicitie…
Oxygen and nitrogen abundances in nearby galaxies. Correlations between oxygen abundance and macroscopic properties
L. S. Pilyugin, J. M. Vilchez, T. Contini
We performed a compilation of more than 1000 published spectra of HII regions in spiral galaxies. The oxygen and nitrogen abundances in each HII region were recomputed in a homogen…
On the oxygen abundance in our Galaxy
L. S. Pilyugin, F. Ferrini, R. V. Shkvarun
The compilation of published spectra of Galactic HII regions with available diagnostic [OIII]4363 line has been carried out. Our list contains 71 individual measurements of 13 HII…
Abundance determinations in HII regions: model fitting versus Te-method
L. S. Pilyugin
The discrepancy between the oxygen abundances in high-metallicity HII regions determined through the Te-method (and/or through the corresponding "strong lines - oxygen abundance" c…
The bends in the slopes of radial abundance gradients in the disks of spiral galaxies -- do they exist?
L. S. Pilyugin
Spiral galaxies with a reported bend in the slope of gradient in the oxygen abundances (O/H)_R23, derived with traditionally used R23 - method, were examined. It is shown that the…
On the origin of nitrogen
L. S. Pilyugin, T. X. Thuan, J. M. Vilchez
The problem of the origin of nitrogen is considered within the framework of an empirical approach. The oxygen abundances and nitrogen to oxygen abundances ratios are derived in HII…
Oxygen and nitrogen abundances in Virgo and field spirals
L. S. Pilyugin, Mercedes Molla, Federico Ferrini +1
The oxygen and nitrogen abundances in the HII regions of the nine Virgo spirals of the sample from Skillman et al (1996) and in nine field spiral galaxies are re-determined with th…
Oxygen abundances in dwarf irregular galaxies and the metallicity - luminosity relationship
L. S. Pilyugin
The low-luminosity dwarf irregular galaxies are considered. The oxygen abundances in HII regions of dwarf irregular galaxies were recalculated from published spectra through the re…
The oxygen abundance distribution in M101
L. S. Pilyugin
The well-observed spiral galaxy M101 was considered. The radial distributions of oxygen abundances determined in three different ways (with the classic Te - method, with the R23 -…
On the oxygen abundance determination in HII regions: High - metallicity regions
L. S. Pilyugin
This is our second paper devoted to the problem of line intensity - oxygen abundance calibration starting from the idea of McGaugh (1991) that the strong oxygen lines contain the n…
On the oxygen abundance determination in HII regions: the problem of the line intensities -- oxygen abundance calibration
L. S. Pilyugin
The problem of the line intensities -- oxygen abundance calibration has been considered. We confirm the idea of McGaugh (1991) that the strong oxygen lines ([OII] 3727, 3729 and [O…
On the origin of the luminosity - metallicity relation for late-type galaxies: Spirals to irregulars transition
L. S. Pilyugin, F. Ferrini
We consider the roles of two widely invoked mechanisms for the metallicity-luminosity correlation among late-type galaxies: higher astration level and decreasing efficiency of heav…
The oxygen abundance deficiency in irregular galaxies
L. S. Pilyugin, F. Ferrini
The observed oxygen abundances in a number of irregular galaxies have been compared with predictions of the closed-box model of chemical and photometric evolution of galaxies. Oxyg…
On the origin of nitrogen in low-metallicity galaxies: Blue compact galaxies versus damped Lya absorbers
L. S. Pilyugin
A remarkably small scatter in the N/O ratios for the HII regions in low-metallicity blue compact galaxies (BCG) has been found recently. It lead to the conclusion that N and O are…