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Chemical abundances of old metal-rich stars in the solar neighborhood
Chen, YQ; Zhao, G; Nissen, PE; Bai, GS; Qiu, HM
2003-07-10
Source PublicationASTROPHYSICAL JOURNAL
Volume591Issue:2Pages:925-935
AbstractWe report on chemical abundances for 15 old metal-rich stars in the solar neighborhood based on high-resolution, high signal-to-noise ratio observations. It is found that [O/Fe], [S/Fe], and probably [Ba/Fe] decrease with increasing metallicity, while the remaining elements, C, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co, and Ni, generally have solar [X/Fe] ratios irrespective of metallicity. The kinematic data indicate a slight lag in the Galactic rotation for most stars. In combination with their low maximum distance perpendicular to the Galactic plane, Z(max), we suggest that most of the sample stars originate from the inner thin disk. This suggestion is supported by the similar abundance pattern of these stars as that of thin-disk stars. The connection of the old metal-rich stars with the old population of the inner disk suggests an inside-out formation of the disk. One exceptional case in our sample is HD 190360. It is suspected to be a thick-disk star based on the enhanced O, S, Mg, and Si abundances as well as the special kinematics, V-LSR = -40 km s(-1) and Z(max) = 1.0 kpc. It shows that stars from a population other than the thin disk exist among old metal-rich stars in the solar neighborhood. The location of these stars, presently in the solar neighborhood, may indicate that orbit diffusion effects of old stars are quite significant.
KeywordGalaxy : Abundances Galaxy : Evolution Solar Neighborhood Stars : Abundances Stars : Kinematics
Indexed BySCI
Language英语
WOS IDWOS:000184016700029
Citation statistics
Cited Times:45[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8461
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus C, Denmark
Recommended Citation
GB/T 7714
Chen, YQ,Zhao, G,Nissen, PE,et al. Chemical abundances of old metal-rich stars in the solar neighborhood[J]. ASTROPHYSICAL JOURNAL,2003,591(2):925-935.
APA Chen, YQ,Zhao, G,Nissen, PE,Bai, GS,&Qiu, HM.(2003).Chemical abundances of old metal-rich stars in the solar neighborhood.ASTROPHYSICAL JOURNAL,591(2),925-935.
MLA Chen, YQ,et al."Chemical abundances of old metal-rich stars in the solar neighborhood".ASTROPHYSICAL JOURNAL 591.2(2003):925-935.
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