43 citations · 129 across the 11 of their papers we have counts for
13 papers
Substructures of the Milky Way's Retrograde Halo: Evidence for Multiple Accretion Events
Young Kwang Kim, Young Sun Lee, Timothy C. Beers
We investigate the progenitors of low-inclination retrograde substructures in the Milky Way (MW) halo, which are remnants of accreted dwarf galaxies on retrograde orbits. Our sampl…
A New Subclass of Carbon-Enhanced Metal-Poor Stars at Extremely Low Metallicity
Young Sun Lee, Timothy C. Beers, Yutaka Hirai +4
We report the discovery of a new subclass of carbon-enhanced metal-poor (CEMP) stars, characterized by high absolute carbon abundances (A(C) > 7.39) and extremely low metallicity (…
A Novel Approach to Identifying Substructures Through Analysis of Metallicity Distribution Functions
Young Kwang Kim, Young Sun Lee, Timothy C. Beers
We present a new method for identifying Galactic halo substructures accreted from dwarf galaxies by combining metallicity distribution functions (MDFs) with orbital parameters. Usi…
Connections between Planetary Populations and the Chemical Characteristics of their Host Stars
Sol Yun, Young Sun Lee, Young Kwang Kim +3
Chemical anomalies in planet-hosting stars (PHSs) are studied in order to assess how the planetary nature and multiplicity affect the atmospheric chemical abundances of their host…
A Dynamically Distinct Stellar Population in the Leading Arm of the Sagittarius Stream
Gwibong Kang, Young Sun Lee, Young Kwang Kim +1
We present a chemical and dynamical analysis of the leading arm (LA) and trailing arm (TA) of the Sagittarius (Sgr) stream, as well as for the Sgr dwarf galaxy core (SC), using red…
Diverse Chemo-Dynamical Properties of Nitrogen-Rich Stars Identified From Low-Resolution Spectra
Changmin Kim, Young Sun Lee, Timothy C. Beers +1
The second generation of stars in the GCs of the MW exhibit unusually high N, Na, or Al, compared to typical Galactic halo stars at similar metallicities. The halo field stars enha…
Search for Extremely Metal-Poor Stars with GEMINI-N/GRACES I. Chemical-Abundance Analysis
Miji Jeong, Young Sun Lee, Timothy C. Beers +5
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…
Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
Ayeon Lee, Young Sun Lee, Young Kwang Kim +2
We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence (MS) stars, which has been referred to as the Splash or Splashed Disk, selected…
Insights into the Formation and Evolution History of the Galactic Disk System
Doo Ri Han, Young Sun Lee, Young Kwang Kim +1
We present a kinematic analysis of a sample of 23,908 G- and K-type dwarfs in the Galactic disk. Based on the -abundance ratio, [/Fe], we separated our sample into low- th…
Chemical Cartography. II. The Assembly History of the Galactic Stellar Halo Traced by Carbon-Enhanced Metal-Poor Stars
Young Sun Lee, Timothy C. Beers, Young Kwang Kim
We present an analysis of the kinematic properties of stellar populations in the Galactic halo, making use of over 100,000 main sequence turnoff (MSTO) stars observed in the Sloan…
Dependence of Galactic Halo Kinematics on the Adopted Galactic Potential
Young Kwang Kim, Young Sun Lee, Timothy C. Beers
We explore differences in Galactic halo kinematic properties derived from two commonly employed Galactic potentials: the Stckel potential and the default Milky Way-like p…
Origin and Status of Low-Mass Candidate Hypervelocity Stars
Bum-Suk Yeom, Young Sun Lee, Jae-Rim Koo +2
We present an analysis of the chemical abundances and kinematics of six low-mass dwarf stars, previously claimed to be candidate hypervelocity stars (HVSs). We obtained moderate-re…
Chemical Cartography. I. A Carbonicity Map of the Galactic Halo
Young Sun Lee, Timothy C. Beers, Young Kwang Kim +5
We present the first map of carbonicity, [C/Fe], for the halo system of the Milky Way, based on a sample of over 100,000 main-sequence turnoff stars with available spectroscopy fro…