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Influence of the convective mixing-length parameter alpha on the chemical abundances in the case of metal-poor giant HD 122563
Song, Nan1,2; Alexeeva, Sofya1; Zhao, Gang1,2
2020-08-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume20Issue:8Pages:12
AbstractOne-dimensional (1D) model atmospheres are still the most commonly used tool for the determination of stellar chemical composition. Convection in the model is usually treated by mixing-length theory (MLT). The mixing-length parameter alpha is generally calibrated from the Sun and applied to all other stars. The metal-poor giant, HD 122563, is an important benchmark star to test stellar atmosphere and interior physics. We investigate the influence of the convection mixing-length parameter alpha on the determination of chemical abundances of Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, Sr, Y, Zr and Ba in the case of HD 122563, taking advantage of a high resolution and high signal-to-noise ratio HARPS spectrum. The abundance discrepancies Delta[X/H] that occur due to alpha variation rarely exceed 0.05 dex and most are less than 0.03 dex. We calculate the discrepancy Delta[X/H] using a line-by-line differential analysis. The abundance discrepancies do not have direct relation with either line strength or the excitation potential. For 1D stellar atmospheric analysis of HD 122563, the accuracy of abundance determination does not strongly depend on the choice of mixing-length parameter alpha(causing average discrepancies of < 0.03 dex), while the uncertainties in the effective temperature and surface gravity play a more important role.
Keywordstars abundances convection stars atmospheres line profiles
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory
DOI10.1088/1674-4527/20/8/121
WOS KeywordSAMPLING MODEL ATMOSPHERES ; TURBULENT CONVECTION ; LINE FORMATION ; MAFAGS-OS ; STELLAR ; STARS ; SIMULATIONS ; IMPROVEMENTS
Language英语
Funding ProjectNational Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11773033] ; National Key R&D Program of China[2019YFA0405502] ; ESO Telescopes at the La Silla Paranal Observatory[080.D-0347 (A)]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; ESO Telescopes at the La Silla Paranal Observatory ; ESO Telescopes at the La Silla Paranal Observatory
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000563437600001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82312
Collection中国科学院国家天文台
Corresponding AuthorZhao, Gang
Affiliation1.Chinese Acad Sci, Natl Astron Observ, 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
Song, Nan,Alexeeva, Sofya,Zhao, Gang. Influence of the convective mixing-length parameter alpha on the chemical abundances in the case of metal-poor giant HD 122563[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(8):12.
APA Song, Nan,Alexeeva, Sofya,&Zhao, Gang.(2020).Influence of the convective mixing-length parameter alpha on the chemical abundances in the case of metal-poor giant HD 122563.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(8),12.
MLA Song, Nan,et al."Influence of the convective mixing-length parameter alpha on the chemical abundances in the case of metal-poor giant HD 122563".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.8(2020):12.
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