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Convective Overshooting in sdB Stars Using the k-omega Model
Li Y(李焱)1,2,3,4; Chen XH(陈兴浩)1,2; Xiong HR(熊赫然)1,2; Guo JJ(郭军军)1,4; Chen XF(陈雪飞)1,2,3; Han ZW(韩占文)1,2,3,4; Li Y(李焱), Email: ly@ynao.ac.cn
发表期刊ASTROPHYSICAL JOURNAL
2018-08-10
卷号863期号:1
DOI10.3847/1538-4357/aacdf9
产权排序第1完成单位
收录类别SCI
关键词Convection Stars: Evolution Stars: Interiors Subdwarfs
摘要Mixing in the convective core is quite uncertain in core helium-burning stars. To explore the overshooting mixing beyond the convective core, we incorporated the k-omega proposed by Li into the Modules of Experiments in Stellar Astrophysics (MESA), and investigated the overshooting mixing in evolution of subdwarf B (sdB) models. We found that the development of the convective core can be divided into three stages. When the radiative temperature gradient, del(rad), monotonically decreases outwardly, the overshooting mixing presents exponential decay similar with Herwig, and the overshooting distance is to make del(rad) similar or equal to del(ad) at the boundary of the convective core, in agreement with the prediction of the self-driving mechanism Castellani et al. When the radiative temperature gradient, del(rad), shows a minimum value near the convective boundary, the convective core may be divided into two if the minimum value of del(rad) is smaller than the adiabatic temperature gradient del(ad). For the single-zone case, the overshooting mixing shows exponential decay, but the overshooting distance is much smaller than in the initial stage. For the double-zone case, the overshooting mixing is similar to that of the single case beyond the convective core, while it almost stops on both sides of the above convective shell. Our overshooting mixing scheme is similar to the maximal overshoot scheme of Constantino et al. In the final stage, helium injections into the convective core by the overshooting mixing happens, similar to the "core breathing pulses."
项目资助者NSFC of China(11333006, 11733008, 11521303) ; Yunnan Province(2017HC018)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000440973300012
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SUBDWARF-B-STARS ; HORIZONTAL-BRANCH STARS ; ATOMIC DIFFUSION ; EVOLUTION ; ORIGIN
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17391
专题恒星物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Li Y(李焱), Email: ly@ynao.ac.cn
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
4.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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GB/T 7714
Li Y,Chen XH,Xiong HR,et al. Convective Overshooting in sdB Stars Using the k-omega Model[J]. ASTROPHYSICAL JOURNAL,2018,863(1).
APA Li Y.,Chen XH.,Xiong HR.,Guo JJ.,Chen XF.,...&Li Y.(2018).Convective Overshooting in sdB Stars Using the k-omega Model.ASTROPHYSICAL JOURNAL,863(1).
MLA Li Y,et al."Convective Overshooting in sdB Stars Using the k-omega Model".ASTROPHYSICAL JOURNAL 863.1(2018).
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