Results 101 to 110 of about 50,982 (241)

Nitrogen Abundance Distribution in the Inner Milky Way

The Astrophysical Journal
We combine a new Galactic plane survey of hydrogen radio recombination lines (RRLs) with far-infrared surveys of ionized nitrogen, N ^+ , to determine nitrogen abundance across Galactic radius.
Jorge L. Pineda, Shinji Horiuchi, L. D. Anderson, Matteo Luisi, William D. Langer, Paul F. Goldsmith, Thomas B. H. Kuiper, Christian Fischer, Yan Gong, Andreas Brunthaler, Michael Rugel, Karl M. Menten   +11 more
doaj   +1 more source

Photoerosion and the abundances of the light elements [PDF]

The abundances of the rare light elements H-2, He-3, Li-7, and B-11 are shown to be potentially affected by photoerosion. That process, involving the interaction of high energy photons from galactic centers with atomic nuclei, will increase the ...
Boyd, Richard N., Ferland, Gary J., Schramm, David N.   +2 more
core   +1 more source

Chemical analysis of ancient relicts in the Milky Way disk

EPJ Web of Conferences, 2012
We present detailed analysis of two groups of F- and G- type stars originally found to have similarities in their orbital parameters. The distinct kinematic properties suggest that they might originate from ancient accretion events in the Milky Way. From
Tautvaišienė G., Ženovienė R., Stonkutė E., Nordström B.   +3 more
doaj   +1 more source

Abundances in the Galactic Clusters of Hyades and M 67 [PDF]

, 1976
R. Foy
openalex   +1 more source

Galactic chemical evolution: abundance gradients of individual elements [PDF]

, 1989
F. Matteuccí, P. François
openalex   +1 more source

R-process and alpha-elements in the Galactic disk: Kinematic correlations

, 2004
Recent studies of elemental abundances in the Galactic halo and in the Galactic disk have underscored the possibility to kinematically separate different Galactic subcomponents.
Grebel, E. K., Koch, Andreas
core  

The APO-K2 Catalog. II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way

The Astronomical Journal
We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic Archaeology Program and elemental abundances from the Apache Point Galactic Evolution ...
Jack T. Warfield, Joel C. Zinn, Jessica Schonhut-Stasik, James W. Johnson, Marc H. Pinsonneault, Jennifer A. Johnson, Dennis Stello, Rachael L. Beaton, Yvonne Elsworth, Rafael A. García, Savita Mathur, Benoît Mosser, Aldo Serenelli, Jamie Tayar   +13 more
doaj   +1 more source

[X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE

The Astrophysical Journal
Chemical cartography of the Galactic disk provides insights into its structure and assembly history over cosmic time. In this work, we use chemical cartography to explore chemical gradients and azimuthal substructure in the Milky Way disk with giant ...
Zoe Hackshaw, Keith Hawkins, Carrie Filion, Danny Horta, Chervin F. P. Laporte, Christopher Carr, Adrian M. Price-Whelan   +6 more
doaj   +1 more source

A study of the abundance distributions along the minor axis of the Galactic Bulge [PDF]

, 1993
Neil deGrasse Tyson, R. Michael Rich
openalex   +1 more source

Probing Chemical Enrichment in Extremely Metal-poor Galaxies

The Astrophysical Journal
The chemical composition of galaxies offers vital insights into their formation and evolution. In particular, the relationship between helium abundance (He/H) and metallicity serves as a key diagnostic for estimating the primordial helium yield from Big ...
Keita Fukushima, Kentaro Nagamine, Akinori Matsumoto, Yuki Isobe, Masami Ouchi, Takayuki R. Saitoh, Yutaka Hirai   +6 more
doaj   +1 more source