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Chemical diversity among A-B stars with low rotational velocities: non-LTE abundance analysis
Mashonkina, L.1; Ryabchikova, T.1; Alexeeva, S.2; Sitnova, T.1; Zatsarinny, O.3
2020-12-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume499Issue:3Pages:3706-3719
AbstractWe present accurate element abundance patterns based on the non-local thermodynamic equilibrium (non-LIE, NLTE) line formation for 14 chemical elements from He to Nd for a sample of nine A9 to B3-type stars with well-determined atmospheric parameters and low rotational velocities. We constructed new model atom of Zr II-III and updated model atoms for Sr II and Ba II by implementing the photoionization cross-sections from calculations with the Dirac B-spline R-matrix method. The NLTE abundances of He to Fe in the stars HD 17081, HD 32115, HD 160762, and HD 209459 are found to be consistent with the solar abundances, and HD 73666 being a Blue Straggler does not reveal deviations from chemical composition of the Praesepe cluster. Three of these stars with an effective temperature of lower than 10 500 K have supersolar abundances of Sr, Zr, Ba, and Nd, and our results suggest the presence of a positive correlation between stellar effective temperature and abundance. For each star, enhancement of Ba is higher than that for any other heavy element. We propose that the solar Ba abundance is not representative of the galactic Ba abundance at modern epoch. The status of HD 145788 was not clarified: This star has solar abundances of C to Si and enhancements of Sr to Ba similar to that for superficially normal stars of similar temperature, while Ca, Ti, and Fe are overabundant. The NLTE abundances of Vega support its status of a mild lambda Bootis star.
Keywordline: formation stars: abundances stars: atmospheres
Funding OrganizationMinistry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation
DOI10.1093/mnras/staa3099
WOS KeywordEQUILIBRIUM-LINE FORMATION ; DAO SPECTROGRAMS ; MODEL ATOM ; MAIN-SEQUENCE ; QUANTITATIVE SPECTROSCOPY ; TRANSITION-PROBABILITIES ; STATISTICAL EQUILIBRIUM ; HYPERFINE-STRUCTURE ; EVOLUTIONARY STATUS ; STELLAR PARAMETERS
Language英语
Funding ProjectMinistry of Science and Higher Education of Russian Federation[13.1902.21.0039]
Funding OrganizationMinistry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation ; Ministry of Science and Higher Education of Russian Federation
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000593116100047
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80058
Collection中国科学院国家天文台
Corresponding AuthorMashonkina, L.
Affiliation1.Russian Acad Sci, Inst Astron, Pyatnitskaya St 48, Moscow 119017, Russia
2.Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China
3.Drake Univ, Dept Phys & Astron, Des Moines, IA 50311 USA
Recommended Citation
GB/T 7714
Mashonkina, L.,Ryabchikova, T.,Alexeeva, S.,et al. Chemical diversity among A-B stars with low rotational velocities: non-LTE abundance analysis[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,499(3):3706-3719.
APA Mashonkina, L.,Ryabchikova, T.,Alexeeva, S.,Sitnova, T.,&Zatsarinny, O..(2020).Chemical diversity among A-B stars with low rotational velocities: non-LTE abundance analysis.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,499(3),3706-3719.
MLA Mashonkina, L.,et al."Chemical diversity among A-B stars with low rotational velocities: non-LTE abundance analysis".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 499.3(2020):3706-3719.
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