ASTEROSEISMIC ANALYSIS OF THE INTERNAL STRUCTURE AND EVOLUTION OF RED GIANT BRANCH BUMP STARS

CORC > 云南天文台 > 中国科学院云南天文台 > 中国科学院天体结构与演化重点实验室

	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
刊名	ASTROPHYSICAL JOURNAL
	2015-05-01
卷号	804 期号:1
关键词	stars: evolution stars: interiors stars: oscillations
ISSN号	0004-637X
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	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
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/804/1/6/meta
语种	英语
WOS记录号	WOS:000354189500006
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9220]
专题	云南天文台_中国科学院天体结构与演化重点实验室
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 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).