ASTEROSEISMIC ANALYSIS OF THE INTERNAL STRUCTURE AND EVOLUTION OF RED GIANT BRANCH BUMP STARS
Gai N(盖宁)1,2; Tang YK(唐延柯)1,2,3
发表期刊ASTROPHYSICAL JOURNAL
2015-05-01
卷号804期号:1
DOI10.1088/0004-637X/804/1/6
收录类别SCI
关键词Stars: Evolution Stars: Interiors Stars: Oscillations
摘要

The "bump" is a prominent feature of the red giant branch (RGB) luminosity function of stellar clusters. Through constructing a grid of models with different masses and metallicities to study the feature of the RGB bump luminosity we find that the luminosity increases almost monotonically with increasing mass for a given metallicity and decreases monotonically with increasing metallicity. Moreover, different stars have different shapes of the RGB bump. It is correlated with the sharpness of the H discontinuity, which is left over by the convection envelope during the first dredge-up. Using the periodicity in the small separations d(01), d(10) to probe the internal structure, we find that, at about half the acoustic radius, the sound speed has a sharp variation that is caused by a local depression of the first adiabatic exponent Gamma(1) in the second helium ionization zone. It induces an oscillation modulation in d(01), d(10) with a period of 6.4 mu Hz. Meanwhile, in the same model, the base of the convective envelope is located at a relatively small acoustic radius t(envp)/T, which is about 10(-1). It is too deep to detect the exact location of the bottom of the outer convective envelope. In order to discriminate the evolutionary status of different stars, we calculate the asymptotic g-mode period spacing Delta Pi(1). We find that Delta Pi(1) decreases monotonically with evolution. It is a reliable parameter for distinguishing stars in different positions of the RGB bump.

资助项目National Natural Science Foundation of China[11203006] ; National Natural Science Foundation of China[11303003] ; Shandong Provincial Natural Science Foundation of China[ZR2012AQ029] ; Shandong Provincial Natural Science Foundation of China[ZR2013AM002] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences[OP201102] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences[OP201206]
项目资助者National Natural Science Foundation of China[11203006, 11303003] ; Shandong Provincial Natural Science Foundation of China[ZR2012AQ029, ZR2013AM002] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences[OP201102, OP201206]
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000354189500006
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SOLAR-LIKE OSCILLATIONS ; GALACTIC GLOBULAR-CLUSTERS ; LUMINOSITY FUNCTION BUMP ; LOW-MASS STARS ; MIXED-MODES ; STELLAR POPULATIONS ; HORIZONTAL-BRANCH ; PERIOD SPACINGS ; P-MODES ; KEPLER
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9220
专题中国科学院天体结构与演化重点实验室
通讯作者Gai N(盖宁)
作者单位1.College of Physics and Electronic Engineering, 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
推荐引用方式
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Gai N,Tang YK. ASTEROSEISMIC ANALYSIS OF THE INTERNAL STRUCTURE AND EVOLUTION OF RED GIANT BRANCH BUMP STARS[J]. ASTROPHYSICAL JOURNAL,2015,804(1).
APA Gai N,&Tang YK.(2015).ASTEROSEISMIC ANALYSIS OF THE INTERNAL STRUCTURE AND EVOLUTION OF RED GIANT BRANCH BUMP STARS.ASTROPHYSICAL JOURNAL,804(1).
MLA Gai N,et al."ASTEROSEISMIC ANALYSIS OF THE INTERNAL STRUCTURE AND EVOLUTION OF RED GIANT BRANCH BUMP STARS".ASTROPHYSICAL JOURNAL 804.1(2015).
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