3 papers
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.GA2023★ 3 cited
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…
astro-ph.GA2022
Estimation of Nitrogen-to-Iron Abundance Ratios From Low-Resolution Spectra
Changmin Kim, Young Sun Lee, Timothy C. Beers +1
We present a method to determine nitrogen abundance ratios with respect to iron ([N/Fe]) from molecular CN-band features observed in low-resolution ( 2000) stellar spectra…