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High-alpha-Metal-Rich stars in the LAMOST-MRS survey and its connection with the galactic bulge
Zhang, Hao-Peng1,2; Chen, Yu-Qin1,2; Zhao, Gang1,2; Zhao, Jing-Kun1,2; Liang, Xi-Long1; Li, Hai-Ning1; Wu, Ya-Qian1; Luo, Ali1; Wang, Rui1
2021-08-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume21Issue:6Pages:9
AbstractWe report the detection of a large sample of high-alpha-metal-rich stars on the low giant branch with 2.6 < log g < 3.3 dex in the LAMOST-MRS survey. This special group corresponds to an intermediate-age population of 5 - 9 Gyr based on the [Fe/H]-[C/N] diagram and age-[C/N] calibration. A comparison group is selected to have a solar alpha ratio at super metallicity, which is young and has a narrow age range around 3 Gyr. Both groups have thin-disk like kinematics but the former shows slightly large velocity dispersions. The special group shows a larger extension in a vertical distance toward 1.2 kpc, a second peak at smaller Galactic radius and a larger fraction of super metal rich stars with [Fe/H] > 0.2 than the comparison group. These properties strongly indicate its connection with the outer bar/bulge region at R = 3 - 5 kpc. A tentative interpretation of this special group is that its stars were formed in the X-shaped bar/bulge region, close to its corotation radius, where radial migration is the most intense, and brings them to present locations at 9 kpc and beyond. Low eccentricities and slightly outward radial excursions of its stars are consistent with this scenario. Its kinematics (cold) and chemistry ([alpha/Fe] similar to 0.1) further support the formation of the instability-driven X-shaped bar/bulge from the thin disk.
Keywordstars late type stars abundances stars fundamental parameters Galaxy disk Galaxy evolution Galaxy structure
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.1088/1674-4527/21/6/153
WOS KeywordCHEMICAL EVOLUTION ; MILKY ; ABUNDANCE ; AGE
Language英语
Funding ProjectNational Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11625313] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11973048] ; National Natural Science Foundation of China[11927804] ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China[2019YFA0405502] ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; National Development and Reform Commission
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Key R&D Program of China ; National Key R&D Program of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000684231200001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/76099
Collection中国科学院国家天文台
Corresponding AuthorChen, Yu-Qin
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Hao-Peng,Chen, Yu-Qin,Zhao, Gang,et al. High-alpha-Metal-Rich stars in the LAMOST-MRS survey and its connection with the galactic bulge[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2021,21(6):9.
APA Zhang, Hao-Peng.,Chen, Yu-Qin.,Zhao, Gang.,Zhao, Jing-Kun.,Liang, Xi-Long.,...&Wang, Rui.(2021).High-alpha-Metal-Rich stars in the LAMOST-MRS survey and its connection with the galactic bulge.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,21(6),9.
MLA Zhang, Hao-Peng,et al."High-alpha-Metal-Rich stars in the LAMOST-MRS survey and its connection with the galactic bulge".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 21.6(2021):9.
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