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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
Source PublicationASTROPHYSICAL JOURNAL
2015-05-01
Volume804Issue:1
DOI10.1088/0004-637X/804/1/6
Indexed BySCI
KeywordStars: Evolution Stars: Interiors Stars: Oscillations
Abstract

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.

Funding ProjectNational 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]
Funding OrganizationNational 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]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000354189500006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSOLAR-LIKE OSCILLATIONS ; GALACTIC GLOBULAR-CLUSTERS ; LUMINOSITY FUNCTION BUMP ; LOW-MASS STARS ; MIXED-MODES ; STELLAR POPULATIONS ; HORIZONTAL-BRANCH ; PERIOD SPACINGS ; P-MODES ; KEPLER
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9220
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorGai N(盖宁)
Affiliation1.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
Recommended Citation
GB/T 7714
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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