Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Qianfan Xing"'
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 68 (2024)
The most metal-poor stars record the earliest metal enrichment triggered by Population III stars. By comparing observed abundance patterns with theoretical yields of metal-free stars, physical properties of their first star progenitors can be inferre
Externí odkaz:
https://doaj.org/article/83883fd08dc34e408aed5ce3b2d4ab86
Autor:
Ruizhi Zhang, Tadafumi Matsuno, Haining Li, Wako Aoki, Xiang-Xiang Xue, Takuma Suda, Gang Zhao, Yuqin Chen, Miho N. Ishigaki, Jianrong Shi, Qianfan Xing, Jingkun Zhao
Publikováno v:
The Astrophysical Journal, Vol 966, Iss 2, p 174 (2024)
Very metal-poor (VMP) stars record the signatures of early accreted galaxies, making them essential tools for unraveling the early stages of Galaxy formation. Understanding the origin of VMP stars requires comprehensive studies of their chemical comp
Externí odkaz:
https://doaj.org/article/fb02387002c6405c81c9bbae3be98d44
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 79 (2024)
The thorium and six second-peak r -process element (56 ≤ Z ≤ 72) abundances are determined for the α -poor star LAMOST J1124+4535 based on a high-resolution spectrum obtained with the High Dispersion Spectrograph on the Subaru Telescope. The age
Externí odkaz:
https://doaj.org/article/39601ba6a6504ee894c9926e32f9ec4c
Autor:
Haining Li, Wako Aoki, Tadafumi Matsuno, Qianfan Xing, Takuma Suda, Nozomu Tominaga, Yuqin Chen, Satoshi Honda, Miho N. Ishigaki, Jianrong Shi, Jingkun Zhao, Gang Zhao
Publikováno v:
Astrophysical Journal, 931(2):147. IOP PUBLISHING LTD
We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. It is the largest high-resolution VMP sample (including 363 new objects
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4deedb4deee7887f5c3e59fd0a1f08ce
http://www.scopus.com/inward/record.url?scp=85132331747&partnerID=8YFLogxK
http://www.scopus.com/inward/record.url?scp=85132331747&partnerID=8YFLogxK
Autor:
Wako Aoki, Haining Li, Tadafumi Matsuno, Qianfan Xing, Yuqin Chen, Norbert Christlieb, Satoshi Honda, Miho N. Ishigaki, Jianrong Shi, Takuma Suda, Nozomu Tominaga, Hong-Liang Yan, Jingkun Zhao, Gang Zhao
Publikováno v:
Astrophysical Journal, 931(2):146. IOP PUBLISHING LTD
The chemical abundances of very metal-poor stars provide important constraints on the nucleosynthesis of the first generation of stars and early chemical evolution of the Galaxy. We have obtained high-resolution spectra with the Subaru Telescope for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6406d27b25e5a5699ba4e5ac18962cb5
Autor:
Haining Li, Miho N. Ishigaki, Takuma Suda, Jingkun Zhao, Maosheng Xiang, Jianrong Shi, Qianfan Xing, Wako Aoki, Tadafumi Matsuno, Masao Takata, Luca Casagrande, David Yong
Publikováno v:
The Astrophysical Journal, 912(1):72. IOP PUBLISHING LTD
We combine asteroseismology, optical high-resolution spectroscopy, and kinematic analysis for 26 halo red giant branch stars in the \textit{Kepler} field in the range of $-2.52$), which constrains a relative age dispersion to $-1.7$ into two [{Mg}/{F
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7804a7128b7cc7f0a4771784be83ddf
https://research.rug.nl/en/publications/ccb7d8df-755d-44a9-a90c-9fb1ea9bbd2f
https://research.rug.nl/en/publications/ccb7d8df-755d-44a9-a90c-9fb1ea9bbd2f
Autor:
Qianfan Xing, Wako Aoki, Gang Zhao, Satoshi Honda, Miho N. Ishigaki, Haining Li, Tadafumi Matsuno
Small stellar systems like dwarf galaxies are suggested to be the main building blocks of our Galaxy by numerical simulations in Lambda CDM models. The existence of star streams like Sagittarius tidal stream indicates that dwarf galaxies play a role
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::33490f5828f2ae91adaa82ac3d97e000
Autor:
Qianfan Xing, Gang Zhao, X. M. Kong, Yuqin Chen, Jingkun Zhao, Jianrong Shi, Wako Aoki, Miho N. Ishigaki, Tadafumi Matsuno, Xilong Liang
We present chemical abundances of 15 stars in the {\gamma} Leo moving group based on high-resolution spectra with the Subaru High Dispersion Spectrograph. The sample was picked up by applying wavelet transform to UVW velocity compo- nents of stars in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa4069f6c08d718a2e40602ab83eccf4
http://arxiv.org/abs/1808.01242
http://arxiv.org/abs/1808.01242
Publikováno v:
Research in Astronomy and Astrophysics. 15:1275-1281
Most Galactic metal-poor stars exhibit enhanced α-abundances (e.g. [Mg/Fe] ~ +0.4) according to previous studies of stellar chemical compositions. However, a handful of metal-poor stars with large deficiencies in Mg (e.g. [Mg/Fe] ~ −0.2) show seve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8fd6d7131fbe9729504282df73e022f2
https://doi.org/10.1088/1674-4527/15/8/012
https://doi.org/10.1088/1674-4527/15/8/012
Tracing Kinematic and Chemical Properties of Sagittarius Stream by K-Giants, M-Giants, and BHB stars
Autor:
Jiang Chang, Lan Zhang, Bo Zhang, Jing Zhong, Xiang-Xiang Xue, Hao Tian, Yaqian Wu, Qianfan Xing, Chengqun Yang, Gang Zhao, Chao Liu, Jeffrey L. Carlin, Chengdong Li, Hans-Walter Rix, Jing Li
Publikováno v:
The Astrophysical Journal. 886:154
We characterize the kinematic and chemical properties of $\sim$3,000 Sagittarius (Sgr) stream stars, including K-giants, M-giants, and BHBs, select from SEGUE-2, LAMOST, and SDSS separately in Integrals-of-Motion space. The orbit of Sgr stream is qui
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a7e8ce9f23e552eacaad148081fb7a2
https://doi.org/10.3847/1538-4357/ab48e2
https://doi.org/10.3847/1538-4357/ab48e2