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Convective Overshooting in Extreme Horizontal-branch Stars Using MESA with the k-omega Model*
Li Z(李志)1,2,3; Li Y(李焱)1,2,3,4
Source PublicationASTROPHYSICAL JOURNAL
2021-12
Volume923Issue:2
DOI10.3847/1538-4357/ac2d8e
Contribution Rank第1完成单位
Indexed BySCI
Abstract

To explore overshoot mixing beyond the convective core in core helium-burning stars, we use the k-omega model, which is incorporated into the Modules of Experiments in Stellar Astrophysics to investigate overshoot mixing in the evolution of subdwarf B (sdB) stars. Our results show that the development of the convective core can be divided into three stages. The mass of the convective core increases monotonically when the radiative temperature gradient, backward difference (rad), monotonically decreases outwardly, and overshoot mixing presents an exponential decay similar to Herwig. The splitting of the convective core occurs repeatedly when the minimum value of backward difference (rad) near the convective boundary is smaller than the adiabatic temperature gradient, backward difference (ad). The mass at the outer boundary of the convective shell M (sc) can exceed 0.2 M (circle dot) after the central helium abundance drops to about Y (c) approximate to 0.45. It is close to the convective core masses derived by asteroseismology for younger models (0.22 to similar to 0.28 M (circle dot)). In the final stage, core breathing pulses occurred two or three times. Helium was injected into the convective core by overshoot mixing and increased the lifetime of sdB stars. The mass of the mixed region M (mixed) can rise to 0.303 M (circle dot) by the end. The oxygen content in the central core of our g-mode sdB models is about 80% by mass. The high amounts of oxygen deduced from asteroseismology may be evidence supporting the existence of core breathing pulses.

Funding ProjectNSFC of ChinaNational Natural Science Foundation of China (NSFC)[11973079] ; NSFC of ChinaNational Natural Science Foundation of China (NSFC)[11521303]
Funding OrganizationNSFC of ChinaNational Natural Science Foundation of China (NSFC)[11973079, 11521303]
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
PublisherIOP Publishing Ltd
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000731758300001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSUBDWARF-B-STARS ; HELIUM-BURNING MODELS ; BREATHING PULSES ; CORE PARAMETERS ; SDB STARS ; EVOLUTION ; ORIGIN ; BALLOON-090100001 ; PULSATORS
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Document Type期刊论文
Version出版稿
Identifierhttp://ir.ynao.ac.cn/handle/114a53/24752
Collection恒星物理研究组
中国科学院天体结构与演化重点实验室
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110 Kunming, 650216, People's Republic Of China;
2.University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049, People's Republic Of China;
3.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110 Kunming, 650216, People's Republic Of China;
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic Of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li Z,Li Y. Convective Overshooting in Extreme Horizontal-branch Stars Using MESA with the k-omega Model*[J]. ASTROPHYSICAL JOURNAL,2021,923(2).
APA Li Z,&Li Y.(2021).Convective Overshooting in Extreme Horizontal-branch Stars Using MESA with the k-omega Model*.ASTROPHYSICAL JOURNAL,923(2).
MLA Li Z,et al."Convective Overshooting in Extreme Horizontal-branch Stars Using MESA with the k-omega Model*".ASTROPHYSICAL JOURNAL 923.2(2021).
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