CALIBRATING THE UPDATED OVERSHOOT MIXING MODEL ON ECLIPSING BINARY STARS: HY Vir, YZ Cas, chi(2) Hya, and VV Crv

	CALIBRATING THE UPDATED OVERSHOOT MIXING MODEL ON ECLIPSING BINARY STARS: HY Vir, YZ Cas, chi(2) Hya, and VV Crv
	Meng Y(蒙盈)1,2 ; Zhang QS(张钱生)1,3
刊名	ASTROPHYSICAL JOURNAL
	2014-06-01
卷号	787 期号:2
关键词	binaries: eclipsing convection stars: evolution
ISSN号	0004-637X
通讯作者	Meng, Y (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Detached eclipsing binary stars with convective cores provide a good tool to investigate convective core overshoot. It has been performed on some binary stars to restrict the classical overshoot model which simply extends the boundary of the fully mixed region. However, the classical overshoot model is physically unreasonable and inconsistent with helioseismic investigations. An updated model of overshoot mixing was established recently. There is a key parameter in the model. In this paper, we use observations of four eclipsing binary stars, i.e., HY Vir, YZ Cas, chi(2) Hya, and VV Crv, to investigate a suitable value for the parameter. It is found that the value suggested by calibrations on eclipsing binary stars is the same as the value recommended by other methods. In addition, we have studied the effects of the updated overshoot model on the stellar structure. The diffusion coefficient of convective/overshoot mixing is very high in the convection zone, then quickly decreases near the convective boundary, and exponentially decreases in the overshoot region. The low value of the diffusion coefficient in the overshoot region leads to weak mixing and a partially mixed overshoot region. Semi-convection, which appears in the standard stellar models of low-mass stars with convective cores, is removed by partial overshoot mixing.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	TURBULENT CONVECTION MODEL ; MASSIVE STARS ; ABSOLUTE PROPERTIES ; STELLAR EVOLUTION ; NONLOCAL CONVECTION ; HELIOSEISMOLOGY ; CONSTRAINTS ; SERPENTIS ; OPACITIES ; INTERIOR
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/787/2/127/meta
语种	英语
WOS记录号	WOS:000336246700032
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6251]
专题	云南天文台_太阳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
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China 2.University of Chinese Academy of Sciences, Beijing 100039, China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式 GB/T 7714	Meng Y,Zhang QS. CALIBRATING THE UPDATED OVERSHOOT MIXING MODEL ON ECLIPSING BINARY STARS: HY Vir, YZ Cas, chi(2) Hya, and VV Crv[J]. ASTROPHYSICAL JOURNAL,2014,787(2).
APA	Meng Y,&Zhang QS.(2014).CALIBRATING THE UPDATED OVERSHOOT MIXING MODEL ON ECLIPSING BINARY STARS: HY Vir, YZ Cas, chi(2) Hya, and VV Crv.ASTROPHYSICAL JOURNAL,787(2).
MLA	Meng Y,et al."CALIBRATING THE UPDATED OVERSHOOT MIXING MODEL ON ECLIPSING BINARY STARS: HY Vir, YZ Cas, chi(2) Hya, and VV Crv".ASTROPHYSICAL JOURNAL 787.2(2014).