Zobrazeno 1 - 10
of 1 263
pro vyhledávání: '"Lee, Young‐Sun"'
Autor:
Hirai, Yutaka, Beers, Timothy C., Lee, Young Sun, Wanajo, Shinya, Roederer, Ian U., Tanaka, Masaomi, Chiba, Masashi, Saitoh, Takayuki R., Placco, Vinicius M., Hansen, Terese T., Ezzeddine, Rana, Frebel, Anna, Holmbeck, Erika M., Sakari, Charli M.
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 simulation of a Milky Way-like galaxy with an $N$-body/smoothed particle
Externí odkaz:
http://arxiv.org/abs/2410.11943
Autor:
Huang, Yang, Beers, Timothy C., Xiao, Kai, Yuan, Haibo, Lee, Young Sun, Gu, Hongrui, Hong, Jihye, Liu, Jifeng, Fan, Zhou, Coelho, Paula, Cruz, Patricia, Galindo-Guil, F. J., Daflon, Simone, Jiménez-Esteban, Fran, Cenarro, Javier, Cristóbal-Hornillos, David, Hernández-Monteagudo, Carlos, López-Sanjuan, Carlos, Marín-Franch, Antonio, Moles, Mariano, Varela, Jesús, Ramírez, Héctor Vázquez, Alcaniz, Jailson, Dupke, Renato, Ederoclite, Alessandro, Sodré Jr., Laerte, Angulo, Raul E.
We present a catalog of stellar parameters (effective temperature $T_{\rm eff}$, surface gravity $\log g$, age, and metallicity [Fe/H]) and elemental-abundance ratios ([C/Fe], [Mg/Fe], and [$\alpha$/Fe]) for some five million stars (4.5 million dwarf
Externí odkaz:
http://arxiv.org/abs/2408.02171
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
Autor:
Spalding, Eckhart, Wilhelm, Ronald, De Lee, Nathan, Long, Stacy, Beers, Timothy C., Placco, Vinicius M., Kielkopf, John, Lee, Young Sun, Pepper, Joshua, Carrell, Kenneth
Publikováno v:
Monthly Notices of the Royal Astronomical Society, vol. 527, issue 1, January 2024, p. 828
RR Lyrae stars play a central role in tracing phase-space structures within the Milky Way because they are easy to identify, are relatively luminous, and are found in large numbers in the Galactic bulge, disk, and halo. In this work, we present a new
Externí odkaz:
http://arxiv.org/abs/2311.13807
Autor:
Hong, Jihye, Beers, Timothy C., Lee, Young Sun, Huang, Yang, Hirai, Yutaka, Garcia, Jonathan Cabrera, Shank, Derek, Xu, Shuai, Yuan, Haibo, Mardini, Mohammad K., Catapano, Thomas, Zhao, Gang, Fan, Zhou, Zheng, Jie, Wang, Wei, Tan, Kefeng, Zhao, Jingkun, Li, Chun
Photometric stellar surveys now cover a large fraction of the sky, probe to fainter magnitudes than large-scale spectroscopic surveys, and are relatively free from the target-selection biases often associated with such studies. Photometric-metallicit
Externí odkaz:
http://arxiv.org/abs/2311.02297
Autor:
Garcia, Jonathan Cabrera, Beers, Timothy C., Huang, Yang, Li, Xin-Yi, Liu, Gaochao, Zhang, Huawei, Hong, Jihye, Lee, Young Sun, Shank, Derek, Gudin, Dmitrii, Hirai, Yutaka, Komater, Dante
We employ a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from the newly calibrated $P$--$\phi_{31}$--$R_{21}$--[Fe/H] and $Gaia$ $G$-band $P$--$R_{21}$--[Fe/H] absolute magnitude-metallicity rela
Externí odkaz:
http://arxiv.org/abs/2307.09572
Autor:
Huang, Yang, Beers, Timothy C., Yuan, Hai-Bo, Tan, Ke-Feng, Wang, Wei, Zheng, Jie, Li, Chun, Lee, Young Sun, Li, Hai-Ning, Zhao, Jing-Kun, Xue, Xiang-Xiang, Liu, Yu-Juan, Zhang, Hua-Wei, Sun, Xue-Ang, Li, Ji, Gu, Hong-Rui, Wolf, Christian, Onken, Christopher A., Liu, Ji-Feng, Fan, Zhou, Zhao, Gang
We present precise photometric estimates of stellar parameters, including effective temperature, metallicity, luminosity classification, distance, and stellar age, for nearly 26 million stars using the methodology developed in the first paper of this
Externí odkaz:
http://arxiv.org/abs/2307.04469
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