Results 111 to 120 of about 58,855 (236)

Leonessa: An Extremely Metal-poor Galaxy Undergoing Secular Chemical Evolution

The Astrophysical Journal
Extremely metal-poor (XMP) galaxies are systems with gas-phase oxygen abundances below ∼5% solar metallicity (12+log(O/H) ≤ 7.35). These galaxies populate the metal-poor end of the mass–metallicity and luminosity–metallicity relations (MZR and LZR ...
Joseph A. Breneman, Kristen B. W. McQuinn, Alexander Menchaca, Danielle A. Berg, O. Grace Telford, Max J. B. Newman, Andrew Dolphin, Gregory R. Zeimann   +7 more
doaj   +1 more source

Chemical evolution of irregular galaxies

, 1998
10 pages, 3 figs, uses moriond.sty. Review presented at XVIIIth Rencontre de Moriond `Dwarf Galaxies and Cosmology', eds.
openaire   +2 more sources

A North–South Metallicity Asymmetry in the Outer Galactic Disk—Evidence for the Pericentric Passage of the Sagittarius Dwarf Galaxy

The Astrophysical Journal Letters
We present maps of the mean metallicity distributions on the Galactocentric R – Z plane at different azimuthal angles using red clump stars selected from the LAMOST and APOGEE surveys.
Chun Wang, Yang Huang, Timothy C. Beers, Payel Das, Haibo Yuan, Lizhi Xie, Shi Shao   +6 more
doaj   +1 more source

The Effects of a Variable IMF on the Chemical Evolution of the Galaxy [PDF]

, 2000
C. Chiappini, F. Matteuccí
openalex   +1 more source

Evidence of Truly Young High-α Dwarf Stars

The Astronomical Journal
The existence of high- α stars with inferred ages
Yuxi(Lucy) Lu, Isabel L. Colman, Maryum Sayeed, Louis Amard, Sven Buder, Catherine Manea, Soichiro Hattori, Marc H. Pinsonneault, Adrian M. Price-Whelan, Megan Bedell, David Nidever, Jennifer A. Johnson, Melissa Ness, Ruth Angus, Zachary R. Claytor, Danny Horta, Aida Behmard   +16 more
doaj   +1 more source

Optical Spectroscopy Reveals Hidden Neutron-capture Elemental Abundance Differences among APOGEE-identified Chemical Doppelgängers

The Astrophysical Journal
Grouping stars by chemical similarity has the potential to reveal the Milky Way’s evolutionary history. The APOGEE stellar spectroscopic survey has the resolution and sensitivity for this task.
Catherine Manea, Melissa Ness, Keith Hawkins, Greg Zeimann, David W. Hogg, Carrie Filion, Emily J. Griffith, Kathryn Johnston, Andrew Casey, Zoe Hackshaw, Tyler Nelson, Micah Marks   +11 more
doaj   +1 more source

Chemically Consistent Evolution of Galaxies on Cosmological Timescales and the DLA Galaxy Population

, 1999
U. Fritze–v. Alvensleben, U. Lindner, C. S. Möller   +2 more
openalex   +2 more sources

Dynamical and chemical evolution of gas-rich dwarf galaxies [PDF]

, 2001
S. Recchi, F. Matteuccí, A. D’Ercole
openalex   +1 more source

Chemical evolution of low mass disc galaxies

, 1999
M. Mollá, Jean-René Roy
openalex   +2 more sources

Early Chemical Evolution of Galaxies

, 1999
Initial conditions are set by Big bang nucleosynthesis from which we know that 90 per cent of baryons are dark and have essentially unknown chemical composition. In our own Galaxy, there are many clues from individual stars in different populations whereas in elliptical galaxies the data largely come from integrated spectra, but these raise problems ...
openaire   +2 more sources