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Mass transfer of low-mass binaries and chemical anomalies among unevolved stars in globular clusters
Wei DD(魏丹丹)1,2,3,4; Wang B(王博)1,2,4; Chen XF(陈雪飞)1,2,4; Chen HL(陈海亮)1,2,4; Li LF(李立芳)1,2,4; Jiang DK(姜登凯)1,2,4
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2020-04-01
Volume493Issue:4Pages:5479-5488
DOI10.1093/mnras/staa613
Contribution Rank第1完成单位
Indexed BySCI
Keywordstars: abundances binaries: general stars: chemically peculiar globular cluster: general
Abstract

While it is well known that mass transfer in binaries can pollute the surfaces of the accretors, it is still unclear whether this mechanism can reproduce the observed chemical inhomogeneities in globular clusters. We study the surface abundances of the accretors in low-mass binaries, as a first step towards understanding whether mass transfer in low-mass binaries is one of the potential origins of the aforementioned abundance anomalies in globular clusters. We use the MESA (MODULES FOR EXPERIMENTS IN STELLAR ASTROPHYSICS) code to calculate binary evolutionary models with different initial donor masses between 0.9 and 1.9 M-circle dot for an initial metallicity of Z = 0.0034. The results show that in some low-mass binary systems, the accretors exhibit peculiar chemical patterns when they are still unevolved stars, e.g. C and O depletion; Na and N enhancement; and constant Mg, Al, and C+N+O. The abundance patterns of the accretors are significantly different from their initial abundances (or that of normal single stars), and can match the observed populations. These abundance patterns strongly depend not only on the initial parameters of binaries (donor mass, mass ratio, and orbital period), but also on the assumptions regarding mass-transfer efficiency and angular momentum loss. These results support the hypothesis that mass transfer in low-mass binaries is, at least, partly responsible for the unevolved anomalous stars in globular clusters. More work on binary evolutionary models and binary population synthesis is required to fully evaluate the contribution of this scenario.

Funding ProjectNatural Science Foundation of China[11573061] ; Natural Science Foundation of China[11661161016] ; Natural Science Foundation of China[11673059] ; Natural Science Foundation of China[11873085] ; Natural Science Foundation of China[11733008] ; Natural Science Foundation of China[11703081] ; Natural Science Foundation of China[11521303] ; Natural Science Foundation of China[11773065] ; Natural Science Foundation of Yunnan Province[2015FB190] ; Natural Science Foundation of Yunnan Province[2017HC018] ; Youth Innovation PromotionAssociation of Chinese Academy of Sciences[2018076]
Funding OrganizationNatural Science Foundation of China[11573061, 11661161016, 11673059, 11873085, 11733008, 11703081, 11521303, 11773065] ; Natural Science Foundation of Yunnan Province[2015FB190, 2017HC018] ; Youth Innovation PromotionAssociation of Chinese Academy of Sciences[2018076]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000539094400065
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMULTIPLE STELLAR POPULATIONS ; MAGELLANIC CLOUD CLUSTERS ; PROTON-CAPTURE ELEMENTS ; RED GIANT BRANCH ; MAIN-SEQUENCE ; TURN-OFF ; ABUNDANCE VARIATIONS ; OMEGA-CENTAURI ; CH STARS ; EVOLUTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/23454
Collection中国科学院天体结构与演化重点实验室
大样本恒星演化研究组
Corresponding AuthorWei DD(魏丹丹); Jiang DK(姜登凯)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wei DD,Wang B,Chen XF,et al. Mass transfer of low-mass binaries and chemical anomalies among unevolved stars in globular clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,493(4):5479-5488.
APA Wei DD,Wang B,Chen XF,Chen HL,Li LF,&Jiang DK.(2020).Mass transfer of low-mass binaries and chemical anomalies among unevolved stars in globular clusters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,493(4),5479-5488.
MLA Wei DD,et al."Mass transfer of low-mass binaries and chemical anomalies among unevolved stars in globular clusters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 493.4(2020):5479-5488.
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