Zobrazeno 1 - 10
of 200
pro vyhledávání: '"Han, Sang Il"'
Autor:
Seo, Eunsuk, Kim, Suk, Lee, Youngdae, Han, Sang-Il, Kim, Hak-Sub, Rey, Soo-Chang, Song, Hyunmi
We present the construction of an image similarity retrieval engine for the morphological classification of galaxies using the Convolutional AutoEncoder (CAE). The CAE is trained on 90,370 preprocessed Sloan Digital Sky Survey galaxy images listed in
Externí odkaz:
http://arxiv.org/abs/2308.01871
Publikováno v:
The Astrophysical Journal, 936, 15 (2022)
Metallicity distributions (MDs) of globular clusters (GCs) provide crucial clues for the assembly and star formation history of their host galaxies. GC colors, when GCs are old, have been used as a proxy of GC metallicities. Bimodal GC color distribu
Externí odkaz:
http://arxiv.org/abs/2209.02738
We performed low-resolution spectroscopy for the red giant branch stars in an intriguing globular cluster (GC) NGC 2808, which hosts subpopulations with extreme helium and light-element abundances. In order to trace N, C, and Ca abundance differences
Externí odkaz:
http://arxiv.org/abs/2106.12583
Autor:
Han, Sang-Il, Kim, Hak-Sub, Yoon, Suk-Jin, Lee, Young-Wook, Arimoto, Nobuo, Okamoto, Sakurako, Ree, Chang H.
A few dozen dwarf satellite galaxies of the Milky Way have been discovered, which are often viewed as the remaining building blocks of our Galaxy. The follow-up spectroscopy showed that dwarf galaxies have a sizeable spread in their metallicities. Se
Externí odkaz:
http://arxiv.org/abs/2001.11138
Publikováno v:
In Bioresource Technology November 2023 387
Autor:
Joo, Seok-Joo, Kyeong, Jaemann, Yang, Soung-Chul, Han, Sang-Il, Sung, Eon-Chang, Rey, Soo-Chang, Jerjen, Helmut, Kim, Hak-Sub, Kim, Dongwon, Jeong, Hyunjin, Ree, Chang H., Cha, Sang-Mok, Lee, Yongseok
We present the detection of RR Lyrae variable stars in the field of the Sagittarius II (Sgr II) ultra-faint dwarf (UFD) galaxy. Using B, V time-series photometry obtained with the Korea Microlensing Telescope Network (KMTNet) 1.6 m telescope at CTIO
Externí odkaz:
http://arxiv.org/abs/1904.01599
Publikováno v:
The Astrophysical Journal Letters, 870, L8 (2019)
We report a possible discovery of a relic star cluster in the Sextans dwarf spheroidal galaxy. Using the \textit{hk} index ($\equiv$($Ca-b$)$-$($b-y$)) as a photometric metallicity indicator, we discriminate the metal-poor and metal-rich stars in the
Externí odkaz:
http://arxiv.org/abs/1901.02458
Akademický článek
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Autor:
Joo, Seok-Joo, Kyeong, Jaemann, Yang, Soung-Chul, Han, Sang-Il, Sung, Eon-Chang, Kim, Dongwon, Jeong, Hyunjin, Ree, Chang H., Rey, Soo-Chang, Jerjen, Helmut, Kim, Hak-Sub, Cha, Sang-Mok, Lee, Yongseok
We report the detection of RR Lyrae variable stars in Crater II, a recently discovered large and diffuse satellite dwarf galaxy of the Milky Way (MW). Based on B, V time-series photometry obtained with the Korea Microlensing Telescope Network (KMTNet
Externí odkaz:
http://arxiv.org/abs/1805.07363
Autor:
Park, Yun Hwan, Han, Sang-Il, Oh, Byeolnim, Kim, Hyun Soo, Jeon, Min Seo, Kim, Sok, Choi, Yoon-E
Publikováno v:
In Bioresource Technology January 2022 344 Part A