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Zong, WK; Charpinet, S1; Fu, JN; Vauclair, G1; Niu, JS; Su, J4,5
Oscillation Mode Variability in Evolved Compact Pulsators from Kepler Photometry. I. The Hot B Subdwarf Star KIC 3527751
发表期刊ASTROPHYSICAL JOURNAL
语种英语
关键词WHITE-DWARF STARS ZZ CETI STARS STRUCTURAL PARAMETERS NONRADIAL PULSATORS DRIVING MECHANISM SPACED DATA ASTEROSEISMOLOGY DISCOVERY MISSION
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.
2018
ISSN0004-637X
卷号853期号:2页码:98
学科领域Astronomy & Astrophysics
学科门类Astronomy & Astrophysics
DOI10.3847/1538-4357/aaa548
收录类别SCIE
引用统计
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/22972
专题理论物理所科研产出_SCI论文
作者单位1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Univ Toulouse, CNRS, UPS, IRAP,CNES, 14 Ave Edouard Belin, F-31400 Toulouse, France
3.Chinese Acad Sci, Inst Theoret Phys, Key Lab Theoret Phys, Beijing 100190, Peoples R China
4.Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Yunnan, Peoples R China
6.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650216, Yunnan, Peoples R China
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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.
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