3 papers
astro-ph.GA2026
The Actinide-Boost Star LAMOST J122216.85-063345.2: A Detailed R-process Abundance Study with Gemini-S/GHOST
Miji Jeong, Young Sun Lee, Vinicius M. Placco +15
We present a detailed chemical-abundance analysis of an actinide-boost ((Th/Dy) = -0.74) star, LAMOST J122216.85-063345.2 (J1222), a very metal-poor ([Fe/H] = -2.45) halo s…
astro-ph.SR2025
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 (…
astro-ph.GA2025
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…