Zobrazeno 1 - 10
of 258
pro vyhledávání: '"Kim, Young Kwang"'
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 stars. We employ APOGEE DR17 to select thin-disk stars of the Milky Wa
Externí odkaz:
http://arxiv.org/abs/2402.19321
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 giant branch, main sequence, and RR Lyrae stars from large spectrosco
Externí odkaz:
http://arxiv.org/abs/2306.16748
Publikováno v:
Journal of the Korean Astronomical Society, Vol.56, No.1, pp.59-73 (2023)
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 enhanced with such elements are believed to have originated in disrupted G
Externí odkaz:
http://arxiv.org/abs/2305.04025
Autor:
Jeong, Miji, Lee, Young Sun, Beers, Timothy C., Placco, Vinicius M., Kim, Young Kwang, Koo, Jae-Rim, Lee, Ho-Gyu, Yang, Soung-Chul
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 SDSS and LAMOST survey. High-resolution spectroscopic observation
Externí odkaz:
http://arxiv.org/abs/2301.06236
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 from Sloan Digital Sky Survey (SDSS) and Large Sky Area Multi-Object
Externí odkaz:
http://arxiv.org/abs/2210.07905
We present a method to determine sodium-abundance ratios ([Na/Fe]) using the Na I D doublet lines in low-resolution ($R \sim$ 2000) stellar spectra. As stellar Na I D lines are blended with those produced by the interstellar medium (ISM), we develope
Externí odkaz:
http://arxiv.org/abs/2109.00142
We present evidence that multiple accretion events are required to explain the origin of the $Gaia$-Sausage and Enceladus (GSE) structures, based on an analysis of dynamical properties of main-sequence stars from the Sloan Digital Sky Survey Data Rel
Externí odkaz:
http://arxiv.org/abs/2104.00275
Publikováno v:
In International Journal of Hydrogen Energy 29 February 2024 57:717-726
We present a kinematic analysis of a sample of 23,908 G- and K-type dwarfs in the Galactic disk. Based on the $\alpha$-abundance ratio, [$\alpha$/Fe], we separated our sample into low-$\alpha$ thin-disk and high-$\alpha$ thick-disk stars. We find a $
Externí odkaz:
http://arxiv.org/abs/2005.04866
Autor:
Lee, Kangpyo, Han, HyukSu, Ryu, Jeong Ho, Kang, Sukhyun, Jung, Kyunghwan, Kim, Young-Kwang, Song, Taeseup, Mhin, Sungwook, Kim, Kang Min
Publikováno v:
In Carbon August 2023 212