Modeling epsilon Eri and Asteroseismic Tests of Element Diffusion

	Modeling epsilon Eri and Asteroseismic Tests of Element Diffusion
	Gai N(盖宁)1,3 ; Bi SL(毕少兰)1,2 ; Tang YK(唐延柯)1,3
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2008-10
卷号	8 期号:5 页码:591-602
关键词	stars: evolution stars: interiors stars: individual: epsilon Eridani
ISSN号	1009-9271
通讯作者	Gai, N (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Taking into account the helium and metal diffusion, we explore the possible evolutionary status with a seismic analysis, of the MOST (Microvariability and Oscillations of STars) target: the star epsilon Eri. We adopt different input parameters to construct models to fit the available observational constraints in, e.g., T-eff, L, R and [Fe/H]. From the computation we obtain the average large spacings of epsilon Eri to be about 194 +/- 1 mu Hz. The age of the diffused models was found to be about 1 Gyr, which is younger than the age determined previously by models without diffusion. We found that the effect of pure helium diffusion on the internal structure of the young low-mass star is slight, but that of metal diffusion is obvious. The metal diffusion leads the models to have much higher temperature in the radiative interior, and, correspondingly a higher sound speed there, hence a larger frequency and spacings.
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]	VEGA-LIKE STARS ; HELIUM DIFFUSION ; SOLAR MODELS ; STELLAR PARAMETERS ; INTERIOR STRUCTURE ; SEISMIC ANALYSIS ; HOST STARS ; OSCILLATIONS ; ERIDANI ; AGE
收录类别	SCI
原文出处	http://iopscience.iop.org/1009-9271/8/5/10/
语种	英语
WOS记录号	WOS:000260455200010
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5193]
专题	云南天文台_恒星物理研究组
作者单位	1.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Department of Astronomy, Beijing Normal University, Beijing 100875, China 3.Graduate School of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Gai N,Bi SL,Tang YK. Modeling epsilon Eri and Asteroseismic Tests of Element Diffusion[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2008,8(5):591-602.
APA	Gai N,Bi SL,&Tang YK.(2008).Modeling epsilon Eri and Asteroseismic Tests of Element Diffusion.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,8(5),591-602.
MLA	Gai N,et al."Modeling epsilon Eri and Asteroseismic Tests of Element Diffusion".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 8.5(2008):591-602.