Results 11 to 20 of about 210,874 (237)
Chemical abundances from the continuum [PDF]
Physica Scripta, 2008 10 pages, 5 figures, to appear in the proceedings of the conference A Stellar Journey, a symposium in celebration of Bengt Gustafsson's 65th birthday, June 23-27, 2008 ...
Allende Prieto C +10 more
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Chemical abundances and kinematics of barium stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 In this paper we present an homogeneous analysis of photospheric abundances based on high-resolution spectroscopy of a sample of 182 barium stars and candidates. We determined atmospheric parameters, spectroscopic distances, stellar masses, ages, luminosities and scale height, radial velocities, abundances of the Na, Al, $alpha$-elements, iron-peak ...
Natalia A. Drake +9 more
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Evolution of chemical abundances in Seyfert galaxies [PDF]
Astronomy & Astrophysics, 2007 17 pages, 15 figures, 3 tables, accepted for publication in A& ...
Francesco Calura +6 more
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Chemical abundances of Planetary Nebulae in M 33 [PDF]
Astronomy & Astrophysics, 2004 17 pages, 6 figures, A&A ...
Mario Perinotto +3 more
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Chemical abundances in Seyfert galaxies – VIII. Argon abundance estimates [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT For the first time, the argon abundance relative to hydrogen abundance (Ar/H) in the narrow line region of a sample of Seyfert 2 nuclei has been derived. In view of this, optical narrow emission line intensities of a sample of 64 local Seyfert 2 nuclei (z < 0.25) taken from Sloan Digital Sky Survey DR7 and measured by the
A F Monteiro, O L Dors
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Observing the signatures of AGB s-process nucleosynthesis in planetary nebulae: An origins story
Frontiers in Astronomy and Space Sciences, 2022 I relate an anecdotal history of the beginnings of a new initiative in studies of the chemical composition of planetary nebulae: namely, investigating abundances of elements beyond the iron-peak through infrared spectroscopy.
Harriet L. Dinerstein
doaj +1 more source
Chemical Tracing and the Origin of Carbon in the Galactic Disk
Universe, 2022 A basic problem in studies of the evolution of chemical elements in galaxies is the uncertainties in the yields of elements produced by different types of stars.
Bengt Gustafsson
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Chemical Evolution of CNO Abundances [PDF]
, 2003 New low and intermediate star yields calculated by Buell (1997) are evaluated by using them in a Galactic Chemical Evolution model.
Mercedes Mollá, M. Gavilán
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Precision Chemical Abundance Measurements [PDF]
Proceedings of the International Astronomical Union, 2012 AbstractThis talk covers preliminary work in which we apply a strictly differential line-by-line chemical abundance analysis to high quality UVES spectra of the globular cluster NGC 6752. We achieve extremely high precision in the measurement of relative abundance ratios.
Yong, David +3 more
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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
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