Results 21 to 30 of about 50,982 (241)
On the influence of the environment on galactic chemical abundances [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 We examine the influence of the environment on the chemical abundances of late-type galaxies with masses of 10^9.1 M_sun - 10^11 M_sun using data from the Sloan Digital Sky Survey(SDSS). We find that the environmental influence on galactic chemical abundances is strongest for galaxies with masses of 10^9.1 M_sun to 10^9.6 Msun.
Lars Mattsson +6 more
openaire +5 more sources
The Abundance of S-Process Elements: Temporal and Spatial Trends from Open Cluster Observations
Universe, 2022 Spectroscopic observations of stars belonging to open clusters, with well-determined ages and distances, are a unique tool for constraining stellar evolution, nucleosynthesis, mixing processes, and, ultimately, Galactic chemical evolution.
Laura Magrini +8 more
doaj +1 more source
Oxygen abundance distribution in the Galactic disc [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We have performed a NLTE analysis of the infrared oxygen triplet for a large number of cepheid spectra obtained with the Hobby-Eberly telescope. These data were combined with our previous NLTE results for the stars observed with Max Planck Gesellschaft telescope with the aim to investigate oxygen abundance distribution in Galactic thin disc.
Jacques Raymond Daniel Lépine +6 more
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Rubidium and zirconium abundances in massive Galactic asymptotic giant branch stars revisited [PDF]
, 2017 Luminous Galactic OH/IR stars have been identified as massive (>4-5 M_s) AGB stars experiencing HBB and Li production. Their Rb abundances and [Rb/Zr] ratios derived from hydrostatic model atmospheres, are significantly higher than predictions from AGB ...
Garcia-Hernandez, D. A. +6 more
core +3 more sources
CHEMICAL COMPOSITION OF GALACTIC DISK STARS
Odessa Astronomical Publications, 2007 Abundances of Na, Al, Ca, in the stars of galactic disks are obtained. The separation of thin and stars on cinematic criterion was made early. The behavior of chemical element abundances with metallicity for studied stars was presented.
T. V. Mishenina +4 more
doaj +1 more source
Boron abundances in the Galactic disk [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractWhen compared to lithium and beryllium, the absence of boron lines in the optical results in a relatively small data set of boron abundances measured in Galactic stars to date. In this paper we discuss boron abundances published in the literature and focus on the evolution of boron in the Galaxy as measured from pristine boron abundances in ...
openaire +3 more sources
THE IRON ABUNDANCE IN GALACTIC PLANETARY NEBULAE [PDF]
The Astrophysical Journal, 2009 Accepted for publication in ApJ.
Antonio Mampaso +3 more
openaire +3 more sources
THE SULPHUR ABUNDANCE BEHAVIOUR IN THE GALACTIC DISC STARS
Odessa Astronomical Publications, 2016 The sulphur abundances in the atmospheres of the F-G-K-type dwarf stars that belong to the thin and thick disc populations (in the metallicity range – 1.0 < [Fe/H] < 0.3) were determined.
T. V. Mishenina, O. P. Paramonova
doaj +1 more source
Planetary Nebula Abundances and Morphology: Probing the Chemical Evolution of the Milky Way [PDF]
, 2006 This paper presents a homogeneous study of abundances in a sample of 79 northern galactic planetary nebulae whose morphological classes have been uniformly determined.
Arturo Manchado +15 more
core +2 more sources
HAFNIUM ABUNDANCES IN FGK DWARF OF GALACTIC DISK
Odessa Astronomical Publications, 2018 In this work we present new observational data for hafnium (72). Hf is an important element that is between the lightest rare-earth elements (e.g., La, Z = 57) with elements of the third r-process peak (Os, Ir, Pt, Z =76-78). Hafnium is the heaviest (Z =
T. I. Gorbaneva, T. V. Mishenina
doaj +1 more source