Results 41 to 50 of about 50,982 (241)
Odessa Astronomical Publications, 2007 We present a new version of the compiled catalogue of nearby stars for which was published the spectoscopically determined effective temperatures, surface gravities, and abundances of iron, magnesium, calcium, silicon, and titanium.
T. V. Borkova +3 more
doaj +1 more source
On the Galactic chemical evolution of sulphur. Sulphur abundances from the [S i] 1082 nm line in giants [PDF]
, 2013 Context. The Galactic chemical evolution of sulphur is still under debate. At low metallicities some studies find no correlation between [S/Fe] and [Fe/H], others find [S/Fe] increasing towards lower metallicities, and still others find a combination of ...
Dupree, A. K., Matrozis, E., Ryde, N.
core +1 more source
Sm and Gd Isotopic Shifts in Eucrites and Implications for Their Cosmic-Ray Exposure History
The Astrophysical Journal, 2023 The isotopic compositions of Sm and Gd in eight eucrites—five from a desert, Dar al Gani (DaG) 380, DaG 391, DaG 411, DaG 443, and DaG 480, and three from nondesert areas, Juvinas, Millibillillie, and Stannern—were determined to understand the cosmic-ray
Takaharu Saito +2 more
doaj +1 more source
The connection between the Galactic halo and ancient Dwarf Satellites
, 2017 We explore the hypothesis that the classical and ultra-faint dwarf spheroidal satellites of the Milky Way have been the building blocks of the Galactic halo by comparing their [O/Fe] and [Ba/Fe] versus [Fe/H] patterns with the ones observed in Galactic ...
Matteucci, F. +3 more
core +1 more source
Chemical abundances in Galactic planetary nebulae with Spitzer spectra [PDF]
, 2014 We present new low-resolution (R~800) optical spectra of 22 Galactic PNe with Spitzer spectra. These data are combined with recent optical spectroscopic data available in the literature to construct representative samples of compact (and presumably young)
Garcia-Hernandez, D. A., Gorny, S. K.
core +2 more sources
Metal abundances in the Galactic Center [PDF]
Symposium - International Astronomical Union, 1999 Recent progress in model atmospheres for hot stars is presented. The impact of nlte wind-blanketed models is shown by comparison with the ‘old’ standard model. In order to confindently use the IR-spectra of objects at the Galactic Center (with high extinction) to derive their physical properties and trace the metal content, the consistency between ...
D. John Hillier +2 more
openaire +2 more sources
Rubidium abundances of galactic disk stars [PDF]
Astronomische Nachrichten, 2021 Spectroscopic determinations of rubidium abundances were made by applying the spectrum‐fitting method to the Rb(i)7800 line for an extensive sample of∼500late‐type dwarfs as well as giants (including Hyades cluster stars) belonging to the galactic disk population, with the aim of establishing the behavior of [Rb/Fe] ratio for disk stars in the ...
openaire +4 more sources
Elemental abundances in AGB stars and the formation of the Galactic bulge
EPJ Web of Conferences, 2012 We obtained high-resolution near-IR spectra of 45 AGB stars located in the Galactic bulge. The aim of the project is to determine key elemental abundances in these stars to help constrain the formation history of the bulge.
Wood P.R. +6 more
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Modeling the Chemical Enrichment History of the Bulge Fossil Fragment Terzan 5
The Astrophysical Journal, 2023 Terzan 5 is a heavily obscured stellar system located in the inner Galaxy. It has been postulated to be a stellar relic, a bulge fossil fragment witnessing the complex history of the assembly of the Milky Way bulge.
Donatella Romano +11 more
doaj +1 more source
, 2012 High-resolution H-band spectra of five bright field K, M, and MS giants, obtained from the archives of the Kitt Peak National Observatory (KPNO) Fourier Transform Spectrometer (FTS), are analyzed to determine chemical abundances of 16 elements.
Bizyaev, Dmitry +10 more
core +1 more source