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
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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 |
DOI | 10.3847/1538-4357/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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