中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Seismic analysis of 70 Ophiuchi A: A new quantity proposed

文献类型:期刊论文

作者Tang YK(唐延柯); Bi SL(毕少兰); Gai N(盖宁)
刊名NEW ASTRONOMY
出版日期2008-11
卷号13期号:8页码:541-548
关键词stars : oscillations stars : evolution stars : individual : 70 Ophiuchi A
ISSN号1384-1076
产权排序第一完成单位
通讯作者Tang, YK reprint author), Chinese Acad Sci, Natl Astron Observ Yurman Observ, Kunming 650011, Peoples R China.
英文摘要The basic intent of this paper is to model 70 Ophiuchi A using the latest asteroseismic observations as complementary constraints and to determine the fundamental parameters of the star. Additionally, we propose a new quantity to lift the degeneracy between the initial chemical composition and stellar age. Using the Yale stellar evolution code (YREC7), we construct a series of stellar evolutionary tracks for the mass range M = 0.85-0.93 M(circle dot) with different composition Y(i) (0.26-0.30) and Z(i) (0.017-0.023). Along these tracks, we select a grid of stellar model candidates that fall within the error box in the HR diagram to calculate the theoretical frequencies, the large- and small-frequency separations using Guenther's stellar pulsation code. Following the asymptotic formula of stellar p-modes, we define a quantity r(01) which is correlated with stellar age. Also, we test it by theoretical adiabatic frequencies of many models. Many detailed models of 70 Ophiuchi A are listed in Table 3. By combining all non-asteroseismic observations available for 70 Ophiuchi A with these seismological data, we think that Model 60, Model 125 and Model 126, listed in Table 3, are the optimum models presently. Meanwhile, we predict that the radius of this star is about 0.860-0.865 R(circle dot) and the age is about 6.8-7.0 Gyr with mass 0.89-0.90 M(circle dot). Additionally, we prove that the new quantity r(01) can be a useful indicator of stellar age. (C) 2008 Elsevier B.V. All rights reserved.
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]SOLAR-LIKE OSCILLATIONS ; ALPHA-CENTAURI-AB ; STELLAR P-MODES ; INTERMEDIATE-MASS STARS ; PROCYON-A ; SEMICLASSICAL APPROXIMATION ; BETA-HYDRI ; MICROSCOPIC DIFFUSION ; ELEMENT DIFFUSION ; ACOUSTIC SPECTRUM
收录类别SCI
原文出处http://www.sciencedirect.com/science/article/pii/S1384107608000237
语种英语
WOS记录号WOS:000257365300001
源URL[http://ir.ynao.ac.cn/handle/114a53/5192]  
专题云南天文台_恒星物理研究组
推荐引用方式
GB/T 7714
Tang YK,Bi SL,Gai N. Seismic analysis of 70 Ophiuchi A: A new quantity proposed[J]. NEW ASTRONOMY,2008,13(8):541-548.
APA 唐延柯,毕少兰,&盖宁.(2008).Seismic analysis of 70 Ophiuchi A: A new quantity proposed.NEW ASTRONOMY,13(8),541-548.
MLA 唐延柯,et al."Seismic analysis of 70 Ophiuchi A: A new quantity proposed".NEW ASTRONOMY 13.8(2008):541-548.

入库方式: OAI收割

来源:云南天文台

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