Results 61 to 70 of about 197,788 (330)
Search for Extremely Metal-poor Stars with Gemini-N/Graces. I. Chemical-abundance Analysis
The Astrophysical Journal, 2023 We present stellar parameters and abundances of 13 elements for 18 very metal-poor (VMP; [Fe/H] < –2.0) stars, selected as extremely metal-poor (EMP; [Fe/H] < –3.0) candidates from the Sloan Digital Sky Survey and Large sky Area Multi-Object Fiber ...
Miji Jeong +7 more
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The Chemical Evolution of Galaxies [PDF]
Proceedings of Frank N. Bash Symposium 2015 — PoS(BASH2015), 2016 The gas-phase oxygen abundance, i.e. metallicity, of a galaxy is set by the interplay between star formation and gas flows. Metals are dispersed into the interstellar medium by stellar winds and supernovae. Metals accumulate in the interstellar medium of star-forming galaxies and provide a record of star-formation.
openaire +1 more source
Chemical evolution of disc galaxies from cosmological simulations [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We perform a suite of cosmological hydrodynamical simulations of disc galaxies, with zoomed-in initial conditions leading to the formation of a halo of mass $M_{\rm halo, \, DM} \simeq 2 \cdot 10^{12}$ M$_{\odot}$ at redshift $z=0$. These simulations aim
M. Valentini +5 more
semanticscholar +1 more source
On the Chemical Evolution of Our Galaxy [PDF]
Publications of the Astronomical Society of Japan, 1996 We have investigated the chemical evolution of the solar neighborhood with a particular emphasis on the helium abundance and the current supernova (SN) rate, while taking into account the effects of the stellar mass loss on nucleosynthesis in stars. We found that the Scalo IMF can reproduce the solar-helium abundance as well as the current ratio of ...
Fumio Takahara, Kuniko Mihara
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From ‘bathtub’ galaxy evolution models to metallicity gradients [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We model gas phase metallicity radial profiles of galaxies in the local Universe by building on the `bathtub' chemical evolution formalism - where a galaxy's gas content is determined by the interplay between inflow, star formation and outflows.
F. Belfiore +4 more
semanticscholar +1 more source
INHOMOGENEITIES OF CHEMICAL COMPOSITION AND COSMOCHRONOLOGY PROBLEMS
Odessa Astronomical Publications, 2017 The problems of determination of chemical composition of stars and connection with theory of chemical evolution of Galaxy are discussed.
V. G. Klochkova, V. E. Panchuk
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Chemical evolution of the Small Magellanic Cloud based on planetary nebulae [PDF]
, 2007 We investigate the chemical evolution of the Small Magellanic Cloud (SMC) based on abundance data of planetary nebulae (PNe). The main goal is to investigate the time evolution of the oxygen abundance in this galaxy by deriving an age-metallicity ...
Allende-Prieto +53 more
core +1 more source
Globular cluster formation and evolution in the context of cosmological galaxy assembly: open questions [PDF]
Proceedings of the Royal Society A, 2018 We discuss some of the key open questions regarding the formation and evolution of globular clusters (GCs) during galaxy formation and assembly within a cosmological framework.
D. Forbes +11 more
semanticscholar +1 more source
The Astrophysical JournalWe present an empirical chemical evolution model that explains the distribution of metals in the interstellar medium (ISM) and the circumgalactic medium (CGM) of galaxies based on the U niverse M achine and N eutral U niverse M achine models in the ...
Moka Nishigaki +7 more
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The Astrophysical Journal Supplement Series, 2023 We present the evolution of the mass–metallicity (MZ) relation at z = 4–10 derived with 135 galaxies identified in JWST/NIRSpec data taken from the three major public spectroscopy programs of ERO, GLASS, and CEERS.
Kimihiko Nakajima +7 more
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