中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Convective Overshooting in the Envelopes of A-type Stars Using the k-omega Model

文献类型:期刊论文

作者Guo F(郭飞)1,2,3; Li Y(李焱)1,2,3,4
刊名The Astrophysical Journal
出版日期2021-03-01
卷号910期号:1页码:10
关键词Stellar convection envelopes A stars Stellar evolution
ISSN号0004-637X
DOI10.3847/1538-4357/abe1c5
产权排序第1完成单位
文献子类Article
英文摘要

Mixing between convective zones is quite uncertain in the envelopes of A-type stars. To study the mixing in A-type envelopes, we use a new convection model, the k-ω model, in the MESA stellar evolution code. Using the k-ω model, we find that the overshooting regions of the He ii and H/He i convection zones are integrated with each other. There is material exchange between the He ii and H/He i convection zones through overshooting, in agreement with recent numerical simulations.We obtain the overshooting distance of about 3.5Hp below the base of the H/He i convection zone in a 2.3 M⊙ star. There are two overshooting regions beyond the He ii convection zone in the same stellar model. We obtain that the overshooting distance of the upper one is about 3.9Hp and about 2.0Hp for the lower one. We find that the turbulent diffusion effect is particularly strong in the convective envelopes of A-type stars. In addition, we find that the typical size of the convective rolling cells is restricted by the actual thickness of the convective zones, because the thickness of the convection zones are usually smaller than or approximately equal to the local pressure scale height. Through comparisons with the results of the k-ω model, we find that a suitable value of fov is about 0.45 for the H/He i convective overshooting region. It is about 0.27 for the upper He ii convective overshooting region and about 0.25 for the lower one.

学科主题天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
资助项目NSFC of China[11973079] ; NSFC of China[11521303]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000632371000001
出版者IOP PUBLISHING LTD
资助机构NSFC of China[11973079, 11521303]
源URL[http://ir.ynao.ac.cn/handle/114a53/24230]  
专题云南天文台_恒星物理研究组
云南天文台_中国科学院天体结构与演化重点实验室
通讯作者Guo F(郭飞)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, People's Republic of China
2.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
4.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, People's Republic of China
推荐引用方式
GB/T 7714
Guo F,Li Y. Convective Overshooting in the Envelopes of A-type Stars Using the k-omega Model[J]. The Astrophysical Journal,2021,910(1):10.
APA Guo F,&Li Y.(2021).Convective Overshooting in the Envelopes of A-type Stars Using the k-omega Model.The Astrophysical Journal,910(1),10.
MLA Guo F,et al."Convective Overshooting in the Envelopes of A-type Stars Using the k-omega Model".The Astrophysical Journal 910.1(2021):10.

入库方式: OAI收割

来源:云南天文台

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