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Chemical abundances of seven stars in the GD-1 Stream

We present the first detailed chemical abundances for seven GD-1 stream stars from Subaru/High Dispersion Spectrograph spectroscopy. Atmospheric parameters were derived via color calibrations (T eff) and iterative spectroscopic analysis. LTE abundances for 14 elements (α, odd Z, iron peak, n-capture...

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Main Authors: Zhao, Jing-Kun (Author) , Li, Guang-Wei (Author) , Aoki, Wako (Author) , Zhao, Gang (Author) , Yang, Guo-Chao (Author) , Shi, Jian-Rong (Author) , Li, Hai-Ning (Author) , Matsuno, Tadafumi (Author) , Ishigaki, Miho (Author) , Suda, Takuma (Author) , Honda, Satoshi (Author) , Chen, Yu-Qin (Author) , Xing, Qian-Fan (Author) , Yan, Hong-Liang (Author) , Yang, Yong (Author) , Ye, Xian-Hao (Author)
Format: Article (Journal)
Language:English
Published: 2025 August 19
In: The astrophysical journal. Part 2, Letters
Year: 2025, Volume: 989, Issue: 2, Pages: 1-11
ISSN:2041-8213
DOI:10.3847/2041-8213/adf630
Online Access:Resolving-System, kostenfrei, Volltext: https://doi.org/10.3847/2041-8213/adf630
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Author Notes:Jing-Kun Zhao, Guang-Wei Li, Wako Aoki, Gang Zhao, Guo-Chao Yang, Jian-Rong Shi, Hai-Ning Li, Tadafumi Matsuno, Miho Ishigaki, Takuma Suda, Satoshi Honda, Yu-Qin Chen, Qian-Fan Xing, Hong-Liang Yan, Yong Yang, and Xian-Hao Ye
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Summary:We present the first detailed chemical abundances for seven GD-1 stream stars from Subaru/High Dispersion Spectrograph spectroscopy. Atmospheric parameters were derived via color calibrations (T eff) and iterative spectroscopic analysis. LTE abundances for 14 elements (α, odd Z, iron peak, n-capture) were measured. Six stars trace the main orbit; one resides in a “blob.” All exhibit tightly clustered metallicities ([Fe/H] = −2.38; intrinsic dispersion smaller than 0.05 dex; average uncertainty is about 0.13 dex). While one star shows binary mass transfer signatures, the other six display consistent abundance patterns (dispersions < uncertainties). Their iron-peak elements (Sc, Cr, Mn, Ni) match Milky Way halo stars. In contrast, Y and Sr are systematically lower than halo stars of similar [Fe/H]. Significantly, six stars show consistently enhanced [Eu/Fe] ∼ 0.60 (σ = 0.08). A tight Ba-Eu correlation (r = 0.83, p = 0.04) exists, with [Ba/Fe] = −0.03 ± 0.05, indicating a common r-process origin. This extreme chemical homogeneity strongly supports an origin from a single disrupted globular cluster. The lack of light-element anticorrelations may stem from our sample size or the progenitor’s low mass.
Item Description:Gesehen am 13.04.2026
Physical Description:Online Resource
ISSN:2041-8213
DOI:10.3847/2041-8213/adf630

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