Chemodynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-s and CEMP-no Stars
We construct a sample of 644 carbon-enhanced metal-poor (CEMP) stars with abundance
analyses based on moderate-to high-resolution spectroscopic studies. Dynamical …
analyses based on moderate-to high-resolution spectroscopic studies. Dynamical …
Probing the Galactic halo with RR Lyrae stars–V. Chemistry, kinematics, and dynamically tagged groups
We employ a sample of 135 873 RR Lyrae stars (RRLs) with precise photometric-metallicity
and distance estimates from the newly calibrated P–ϕ31–R 21–[Fe/H] and Gaia G band P–R …
and distance estimates from the newly calibrated P–ϕ31–R 21–[Fe/H] and Gaia G band P–R …
Europium enrichment and hierarchical formation of the Galactic halo
L Cavallo, G Cescutti, F Matteucci - Astronomy & Astrophysics, 2023 - aanda.org
Context. The origin of the large star-to-star variation of the [Eu/Fe] ratios observed in the
extremely metal-poor (at [Fe/H]≤− 3) stars of the Galactic halo is still a matter of debate …
extremely metal-poor (at [Fe/H]≤− 3) stars of the Galactic halo is still a matter of debate …
Discovery of an Extremely r-process-enhanced Thin-disk Star with [Eu/H]=+ 0.78
XJ Xie, J Shi, HL Yan, TY Chen, CA Prieto… - The Astrophysical …, 2024 - iopscience.iop.org
Highly r-process-enhanced (RPE) stars are rare and usually metal poor ([Fe/H]<− 1.0), and
they mainly populate the Milky Way halo and dwarf galaxies. This study presents the …
they mainly populate the Milky Way halo and dwarf galaxies. This study presents the …
Detection of the Actinide Th in an r-process-enhanced Star with Accretion Origin
The thorium and six second-peak r-process element (56≤ Z≤ 72) abundances are
determined for the α-poor star LAMOST J1124+ 4535 based on a high-resolution spectrum …
determined for the α-poor star LAMOST J1124+ 4535 based on a high-resolution spectrum …
Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. III. Dynamically Tagged Groups and Chemodynamical Properties
R Zhang, T Matsuno, H Li, W Aoki, XX Xue… - The Astrophysical …, 2024 - iopscience.iop.org
Very metal-poor (VMP) stars record the signatures of early accreted galaxies, making them
essential tools for unraveling the early stages of Galaxy formation. Understanding the origin …
essential tools for unraveling the early stages of Galaxy formation. Understanding the origin …
The -process Alliance: Enrichment of -process Elements in a Simulated Milky Way-like Galaxy
We study the formation of stars with varying amounts of heavy elements synthesized by the
rapid neutron-capture process ($ r $-process) based on our detailed cosmological zoom-in …
rapid neutron-capture process ($ r $-process) based on our detailed cosmological zoom-in …
The R-Process Alliance: 2MASS J22132050-5137385, the Star with the Highest-known r-process Enhancement at [Eu/Fe]=+ 2.45
We present stellar parameters and chemical abundances of 47 elements detected in the
bright (V= 11.63) very metal-poor ([Fe/H]=-2.20+-0.12) star 2MASS J22132050-5137385 …
bright (V= 11.63) very metal-poor ([Fe/H]=-2.20+-0.12) star 2MASS J22132050-5137385 …
An integrated perspective of robustness in regression through the lens of the bias-variance trade-off
A Okuno - arXiv preprint arXiv:2407.10418, 2024 - arxiv.org
This paper presents an integrated perspective on robustness in regression. Specifically, we
examine the relationship between traditional outlier-resistant robust estimation and robust …
examine the relationship between traditional outlier-resistant robust estimation and robust …
Detection of the actinide Th in an r-process-enhanced star with accretion origin
X Qianfan, Z Gang, A Wako, L Haining… - arXiv preprint arXiv …, 2024 - arxiv.org
The thorium and six second-peak r-process element (56< Z< 72) abundances are
determined for the alpha-poor star LAMOST J1124+ 4535 based on a high-resolution …
determined for the alpha-poor star LAMOST J1124+ 4535 based on a high-resolution …