| Seismic analysis of 70 Ophiuchi A: A new quantity proposed |
| Tang YK(唐延柯); Bi SL(毕少兰); Gai N(盖宁); Tang, YK reprint author), Chinese Acad Sci, Natl Astron Observ Yurman Observ, Kunming 650011, Peoples R China.
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| 发表期刊 | NEW ASTRONOMY
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| 2008-11
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| 卷号 | 13期号:8页码:541-548 |
| DOI | 10.1016/j.newast.2008.02.002
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| 产权排序 | 第1完成单位
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| 收录类别 | SCI
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| 关键词 | Stars : Oscillations
Stars : Evolution
Stars : Individual : 70 Ophiuchi a
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| 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. |
| 语种 | 英语
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| 学科领域 | Astronomy & Astrophysics
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| 文章类型 | Article
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| ISSN | 1384-1076
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| URL | 查看原文
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| 归档日期 | 2008-04-15
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| WOS记录号 | WOS:000257365300001
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| WOS研究方向 | Astronomy & Astrophysics
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| WOS类目 | Astronomy & Astrophysics
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| 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
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5192
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| 专题 | 恒星物理研究组
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| 通讯作者 | Tang, YK reprint author), Chinese Acad Sci, Natl Astron Observ Yurman Observ, Kunming 650011, Peoples R China. |
推荐引用方式
GB/T 7714 |
Tang YK,Bi SL,Gai N,et al. Seismic analysis of 70 Ophiuchi A: A new quantity proposed[J]. NEW ASTRONOMY,2008,13(8):541-548.
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| APA |
唐延柯,毕少兰,盖宁,&Tang, YK reprint author), Chinese Acad Sci, Natl Astron Observ Yurman Observ, Kunming 650011, Peoples R China..(2008).Seismic analysis of 70 Ophiuchi A: A new quantity proposed.NEW ASTRONOMY,13(8),541-548.
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| MLA |
唐延柯,et al."Seismic analysis of 70 Ophiuchi A: A new quantity proposed".NEW ASTRONOMY 13.8(2008):541-548.
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