Oscillation Mode Variability in Evolved Compact Pulsators from Kepler Photometry. I. The Hot B Subdwarf Star KIC 3527751

doi:10.3847/1538-4357/aaa548

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	Oscillation Mode Variability in Evolved Compact Pulsators from Kepler Photometry. I. The Hot B Subdwarf Star KIC 3527751
	Zong, WK ; Charpinet, S 2; Fu, JN ; Vauclair, G 2; Niu, JS ; Su, J 3,4
刊名	ASTROPHYSICAL JOURNAL
	2018
卷号	853 期号:2 页码:98
关键词	WHITE-DWARF STARS ZZ CETI STARS STRUCTURAL PARAMETERS NONRADIAL PULSATORS DRIVING MECHANISM SPACED DATA ASTEROSEISMOLOGY DISCOVERY MISSION
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaa548
英文摘要	We present the first results of an ensemble and systematic survey of oscillation mode variability in pulsating hot B subdwarf (sdB) and white dwarf stars observed with the original Kepler mission. The satellite provides uninterrupted high-quality photometric data with a time baseline that can reach up to 4 yr collected on pulsating stars. This is a unique opportunity to characterize long-term behaviors of oscillation modes. A mode modulation in amplitude and frequency can be independently inferred by its fine structure in the Fourier spectrum, from the sLSP, or with prewhitening methods applied to various parts of the light curve. We apply all these techniques to the sdB star KIC 3527751, a long-period-dominated hybrid pulsator. We find that all the detected modes with sufficiently large amplitudes to be thoroughly studied show amplitude and/or frequency variations. Components of three identified quintuplets around 92, 114, and 253 mu Hz show signatures that can be linked to nonlinear interactions according to the resonant mode coupling theory. This interpretation is further supported by the fact that many oscillation modes are found to have amplitudes and frequencies showing correlated or anticorrelated variations, a behavior that can be linked to the amplitude equation formalism, where nonlinear frequency corrections are determined by their amplitude variations. Our results suggest that oscillation modes varying with diverse patterns are a very common phenomenon in pulsating sdB stars. Close structures around main frequencies therefore need to be carefully interpreted in light of this finding to secure a robust identification of real eigenfrequencies, which is crucial for seismic modeling. The various modulation patterns uncovered should encourage further developments in the field of nonlinear stellar oscillation theory. It also raises a warning to any long-term project aiming at measuring the rate of period change of pulsations caused by stellar evolution, or at discovering stellar (planetary) companions around pulsating stars using timing methods, as both require very stable pulsation modes.
学科主题	Astronomy & Astrophysics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22972]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650216, Yunnan, Peoples R China 2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 3.Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Yunnan, Peoples R China 5.Univ Toulouse, CNRS, UPS, IRAP,CNES, 14 Ave Edouard Belin, F-31400 Toulouse, France 6.Chinese Acad Sci, Inst Theoret Phys, Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zong, WK,Charpinet, S,Fu, JN,et al. Oscillation Mode Variability in Evolved Compact Pulsators from Kepler Photometry. I. The Hot B Subdwarf Star KIC 3527751[J]. ASTROPHYSICAL JOURNAL,2018,853(2):98.
APA	Zong, WK,Charpinet, S,Fu, JN,Vauclair, G,Niu, JS,&Su, J.(2018).Oscillation Mode Variability in Evolved Compact Pulsators from Kepler Photometry. I. The Hot B Subdwarf Star KIC 3527751.ASTROPHYSICAL JOURNAL,853(2),98.
MLA	Zong, WK,et al."Oscillation Mode Variability in Evolved Compact Pulsators from Kepler Photometry. I. The Hot B Subdwarf Star KIC 3527751".ASTROPHYSICAL JOURNAL 853.2(2018):98.