Results 141 to 150 of about 7,914 (245)
The Astrophysical JournalUsing elemental abundances for 1.26 million K giants in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope DR8 value-added catalog, we analyze the chemical abundances of the Virgo Overdensity and Hercules–Aquila Cloud.
Haoyang Liu +3 more
doaj +1 more source
On the compact H II galaxy UM 408 as seen by GMOS-IFU: physical conditions [PDF]
, 2009 We present Integral Field Unit GMOS-IFU data of the compact HII Galaxy UM 408, obtained at Gemini South telescope, in order to derive the spatial distribution of emission lines and line ratios, kinematics, plasma parameters, and oxygen abundances as well
GUILLERMO TENORIO TAGLE
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Modeling the Ages and Chemical Abundances of Elliptical Galaxies
The Astrophysical JournalSpectroscopic studies of elliptical galaxies show that their stellar population ages, mean metallicity, and α enhancement traced by [Mg/Fe] all increase with galaxy stellar mass or velocity dispersion.
Nicole Marcelina Gountanis +5 more
doaj +1 more source
On the Abundances of Li, Be and O in Metal-Poor Stars in the Galaxy
, 2005 Stellar atmospheres constitute excellent environments to study the chemical evolution of our Galaxy. The chemical composition of these atmospheres reflects the composition of the gas from where these stars were born.
García Pérez, Ana Elia
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Investigation of Substructures of the Inner Halo Using the StarGO Algorithm with APOGEE DR17
The Astrophysical JournalWe applied the Stars’ Galactic Origin algorithm in 7D space (i.e., [Fe/H], [Mg/Fe], [Al/Fe], L _z , J _r , J _z , E ) to analyze stars in the inner halo with APOGEE DR17.
Zhongcheng Li +3 more
doaj +1 more source
Chemical Abundances in the Leiptr Stellar Stream: A Disrupted Ultra-faint Dwarf Galaxy?
Chemical abundances of stellar streams can be used to determine the nature of a stream's progenitor. Here we study the progenitor of the recently discovered Leiptr stellar stream, which was previously suggested to be a tidally disrupted halo globular ...
Lara R. Cullinane +13 more
core +1 more source
The High-Redshift Gas-Phase Mass–Metallicity Relation in FIRE-2
The Astrophysical Journal LettersThe unprecedented infrared spectroscopic capabilities of JWST have provided high-quality interstellar medium metallicity measurements and enabled characterization of the gas-phase mass–metallicity relation (MZR) for galaxies at z ≳ 5 for the first time ...
Andrew Marszewski +4 more
doaj +1 more source
Classical Cepheids in the Galactic thin disk
Astronomy & AstrophysicsClassical Cepheids (CCs) have long been considered excellent tracers of the chemical evolution of the Milky Way’s young disk. We present a homogeneous, non-local thermodynamical equilibrium (NLTE) spectroscopic analysis of 401 Galactic CCs, based on 1351
Nunnari A. +26 more
doaj +1 more source
The Astrophysical JournalWe present a detailed chemical-abundance analysis of an actinide-boost ( $\mathrm{log}\epsilon $ (Th/Dy) = –0.74) star, LAMOST J122216.85–063345.2 (J1222), a very metal-poor ([Fe/H] = –2.45) halo star with moderate enhancement in rapid neutron-capture ...
Miji Jeong +17 more
doaj +1 more source
Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy
, 2017 Indexación: ScopusWe present iron, magnesium, calcium, and titanium abundances for 235 stars in the central region of the Sagittarius dwarf spheroidal galaxy (within 9:00∼70 pc from the centre) from medium-resolution Keck/Deep Imaging Multi-Object ...
Monaco L. +5 more
core +1 more source