564 citations
- National Academy of Sciences of UkraineUA6 papers
- Crimean Astrophysical ObservatoryUA2 papers
- Instituto de Astrofísica de CanariasES2 papers
- Laboratoire Univers et ThéoriesFR2 papers
- Special Astrophysical ObservatoryRU2 papers
- University of VirginiaUS2 papers
- Astronomical ObservatoryRS1 paper
- Australian National UniversityAU1 paper
- Carnegie Institution for ScienceUS1 paper
- Harvard University PressUS1 paper
- Imperial College LondonGB1 paper
- Institute for Nuclear ResearchRU1 paper
12 papers · 1 filter
New Probable Dwarf Galaxies in Northern Groups of the Local Supercluster
I. D. Karachentsev, V. E. Karachentseva, W. K. Huchtmeier
We have searched for nearby dwarf galaxies in 27 northern groups with characteristic distances 8-15 Mpc based on the Second Palomar Sky Survey prints. In a total area of about 2000…
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…
Experimental Ti I oscillator strengths and their application to cool star analysis
R. J. Blackwell-Whitehead, H. Lundberg, G. Nave +5
We report experimental oscillator strengths for 88 Ti I transitions covering the wavelength range 465 to 3892 nm, 67 of which had no previous experimental values. Radiative lifetim…
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…
The Spitzer View of Low-Metallicity Star Formation: I. Haro 3
L. K. Hunt, T. X. Thuan, M. Sauvage +1
We present Spitzer observations of the blue compact dwarf galaxy (BCD) Haro 3, with an oxygen abundance of 12+log(O/H)=8.32. These data are part of a larger study of star formation…