Results 91 to 100 of about 210,874 (237)
The Sunburst Arc with JWST. III. An Abundance of Direct Chemical Abundances
The Astrophysical JournalAbstract We measure the gas-phase abundances of the elements He, N, O, Ne, S, Ar, and Fe in an individual H ii region known to be leaking Lyman-continuum photons in the Sunburst Arc, a highly magnified galaxy at redshift z = 2.37. We detect the temperature-sensitive auroral lines [S ii] λλ4070, 4076, [O iii] λ4363, [S ...
Brian Welch +13 more
openaire +3 more sources
The Chemical Abundances of the Halo Clusters of the Galaxy [PDF]
, 1978 R. Canterna, R. A. Schommer
openalex +1 more source
Tracking the Chemical Evolution of Hydrocarbons Through Carbon Grain Supply in Protoplanetary Disks
The Astrophysical JournalThe gas present in planet-forming disks typically exhibits strong emission features of abundant carbon and oxygen molecular carriers. In some instances, protoplanetary disks show an elevated C/O ratio above interstellar values, which leads to a rich ...
Eshan Raul +2 more
doaj +1 more source
Density Distribution and Chemical Abundances in NGC 7027 [PDF]
, 1978 Andrea Preite-Martinez, Nino Panagiat
openalex +1 more source
Solar nebula condensates and the composition of comets [PDF]
Interpretation of the volatile abundances in Halley's comet in terms of models for chemical and physical processes in the solar nebula are discussed.
Lunine, J. I.
core +1 more source
Novae: An Important Source of Lithium in the Galaxy
The Astrophysical JournalThe source of the Galactic lithium (Li) has long been a puzzle. With the discovery of Li in novae, extensive research has been conducted. However, there still exists a significant disparity between the observed abundance of Li in novae and the existing ...
Jun Gao +6 more
doaj +1 more source
Galactic chemical evolution: abundance gradients of individual elements [PDF]
, 1989 F. Matteuccí, P. François
openalex +1 more source
Analysis of the Internal Radial Gradient of Chemical Abundances in Spiral Galaxies from CALIFA
The Astrophysical JournalThe study of chemical evolution is of paramount importance for understanding the evolution of galaxies. Models and observations propose an inside-out mechanism in the formation of spiral galaxy disks, implying a negative radial gradient of elemental ...
A. F. S. Cardoso +3 more
doaj +1 more source
On the Chemical Abundances, Evolutionary Stage and Bolometric Magnitude of WR Stars [PDF]
, 1982 D. Vanbeveren
openalex +1 more source
The Astrophysical JournalGas-phase metallicity gradients are a crucial element in understanding the chemical evolution of galaxies. We use the FOGGIE simulations to study the metallicity gradients (∇ Z ) of six Milky Way–like galaxies throughout their evolution.
Ayan Acharyya +9 more
doaj +1 more source