THE RELATIONSHIP BETWEEN nu(max) AND AGE t FROM ZAMS TO RGB-TIP FOR LOW-MASS STARS
Tang, Y. K.1,2,3; Gai, N.1,2; Tang, YK (reprint author), Dezhou Univ, Dept Phys, Dezhou 253023, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2013-07-10
卷号771期号:2
DOI10.1088/0004-637X/771/2/99
收录类别SCI
关键词Stars: Evolution Stars: Low-mass Stars: Oscillations
摘要Stellar age is an important quantity in astrophysics, which is useful for many fields both in the universe and galaxies. It cannot be determined by direct measurements, but can only be estimated or inferred. We attempt to find a useful indicator of stellar age, which is accurate from the zero-age main sequence to the tip of red giant branch for low-mass stars. Using the Yale Rotation and Evolution Code (YREC), a grid of stellar models has been constructed. Meanwhile, the frequency of maximum oscillations' power nu(max) and the large frequency separation Delta nu are calculated using the scaling relations. For the stars, the masses of which are from 0.8M(circle dot) to 2.8M(circle dot), we can obtain the nu(max) and stellar age by combing the scaling relations with the four sets of grid models (YREC, Dotter et al., Marigo et al., and YY isochrones). We find that nu(max) is tightly correlated and decreases monotonically with the age of the star from the main sequence to the red giant evolutionary stages. Moreover, we find that the line shapes of the curves in the Age versus nu(max) diagram, which is plotted by the four sets of grid models, are consistent for red giants with masses from 1.1 M-circle dot to 2.8 M-circle dot. For red giants, the differences of correlation coefficients between Age and nu(max) for different grid models are minor and can be ignored. Interestingly, we find two peaks that correspond to the subgiants and bump of red giants in the Age versus nu(max) diagram. By general linear least-squares, we make the polynomial fitting and deduce the relationship between log(Age) and log(nu(max)) in red giants' evolutionary state.
项目资助者National Natural Science Foundation of China(11203006) ; Shandong Provincial Natural Science Foundation of China(ZR2012AQ029,ZR2012AM008,JQ201212) ; Dezhou University Foundation(402126) ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences(OP201102,OP201206)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000321340700024
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SOLAR-LIKE OSCILLATIONS ; STELLAR EVOLUTION CODE ; RED GIANTS ; ASTEROSEISMIC DIAGRAMS ; MAIN-SEQUENCE ; NGC 6819 ; KEPLER ; ISOCHRONES ; ABUNDANCES ; OPACITIES
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9421
专题中国科学院天体结构与演化重点实验室
通讯作者Tang, YK (reprint author), Dezhou Univ, Dept Phys, Dezhou 253023, Peoples R China.
作者单位1.Department of Physics, Dezhou University, Dezhou 253023, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Weihai 264209, China
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Tang, Y. K.,Gai, N.,Tang, YK . THE RELATIONSHIP BETWEEN nu(max) AND AGE t FROM ZAMS TO RGB-TIP FOR LOW-MASS STARS[J]. ASTROPHYSICAL JOURNAL,2013,771(2).
APA Tang, Y. K.,Gai, N.,&Tang, YK .(2013).THE RELATIONSHIP BETWEEN nu(max) AND AGE t FROM ZAMS TO RGB-TIP FOR LOW-MASS STARS.ASTROPHYSICAL JOURNAL,771(2).
MLA Tang, Y. K.,et al."THE RELATIONSHIP BETWEEN nu(max) AND AGE t FROM ZAMS TO RGB-TIP FOR LOW-MASS STARS".ASTROPHYSICAL JOURNAL 771.2(2013).
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