High-resolution Chemical Abundances of the Nyx Stream
The Astrophysical Journal, 2023 Nyx is a nearby, prograde, and high-eccentricity stellar stream physically contained in the thick disk, but its origin is unknown. Nyx could be the remnant of a disrupted dwarf galaxy, in which case the associated dark matter substructure could affect ...
Shuyu Wang +7 more
doaj +1 more source
Chemical abundances and radial velocities in the extremely metal-poor galaxy DDO 68 [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We present chemical abundances and radial velocities of six HII regions in the extremely metal-poor star-forming dwarf galaxy DDO 68. They are derived from deep spectra in the wavelength range 3500 - 10,000 {\AA}, acquired with the Multi Object Double ...
F. Annibali +20 more
semanticscholar +1 more source
Constraining cosmic scatter in the Galactic halo through a differential analysis of metal-poor stars [PDF]
, 2017 © ESO 2017.Context. The chemical abundances of metal-poor halo stars are important to understanding key aspects of Galactic formation and evolution. Aims.
Amanda Karakas +131 more
core +3 more sources
Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. I. Signatures of Diffusion in the Open Cluster M67 [PDF]
, 2018 Detailed chemical abundance distributions for 14 elements are derived for eight high-probability stellar members of the solar metallicity old open cluster M67 with an age of ∼4 Gyr.
D. Souto +27 more
semanticscholar +1 more source
Chemical Abundances of New Member Stars in the Tucana II Dwarf Galaxy [PDF]
, 2018 We present chemical abundance measurements for seven stars with metallicities ranging from Fe/H] = −3.3 to [Fe/H] = −2.4 in the Tucana II ultra-faint dwarf galaxy (UFD), based on high-resolution spectra obtained with the MIKE spectrograph on the 6.5 m ...
A. Chiti +5 more
semanticscholar +1 more source
Systematic investigation of chemical abundances derived using IR spectra obtained with GIANO [PDF]
Astronomy & Astrophysics, 2018 Context. Detailed chemical abundances of Galactic stars are needed in order to improve our knowledge of the formation and evolution of our galaxy, the Milky Way. Aims.
E. Caffau +14 more
semanticscholar +1 more source
Li-rich Giants Identified from LAMOST DR8 Low-resolution Survey
The Astronomical Journal, 2023 A small fraction of giants possess photospheric lithium (Li) abundance higher than the value predicted by the standard stellar evolution models, and the detailed mechanisms of Li enhancement are complicated and lack a definite conclusion.
Beichen Cai +5 more
doaj +1 more source
Chemical Abundances of Hydrostatic and Explosive Alpha-elements in Sagittarius Stream Stars [PDF]
, 2018 We analyze chemical abundances of stars in the Sagittarius (Sgr) tidal stream using high-resolution Gemini+GRACES spectra of 42 members of the highest surface-brightness portions of both the trailing and leading arms.
J. Carlin +3 more
semanticscholar +1 more source
A volume-limited survey of mCP stars within 100 pc – I. Fundamental parameters and chemical abundances [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We present the first results of a volume-limited survey of main sequence (MS) magnetic chemically peculiar (mCP) stars. The sample consists of all identified intermediate-mass MS stars (mCP and non-mCP) within a heliocentric distance of $100\,{\rm pc ...
J. Sikora +5 more
semanticscholar +1 more source
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
doaj +1 more source