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Oscillation Mode Variability in Evolved Compact Pulsators from Kepler Photometry. I. The Hot B Subdwarf Star KIC 3527751
Zong, Weikai1,2; Charpinet, Stephane2; Fu, Jian-Ning1; Vauclair, Gerard2; Niu, Jia-Shu3,4; Su J(苏杰)1,5,6
Source PublicationASTROPHYSICAL JOURNAL
2018-02-01
Volume853Issue:2
DOI10.3847/1538-4357/aaa548
Contribution Rank第5完成单位
Indexed BySCI
KeywordStars: Individual (Kic 3527751) Stars: Oscillations (Including Pulsations) Techniques: Photometric
Abstract

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.

Funding ProjectProgramme National de Physique Stellaire (PNPS) of CNRS/INSU, France ; Centre National d'Etudes Spatiales (CNES, France) ; National Natural Science Foundation of China (NSFC)[11673003] ; National Basic Research Program of China (973 Program)[2014CB845700] ; NASA's Science Mission Directorate
Funding OrganizationProgramme National de Physique Stellaire (PNPS) of CNRS/INSU, France ; Centre National d'Etudes Spatiales (CNES, France) ; National Natural Science Foundation of China (NSFC)[11673003] ; National Basic Research Program of China (973 Program)[2014CB845700] ; NASA's Science Mission Directorate
Language英语
Subject Area天文学 ; 恒星与银河系
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:000423444200002
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordWHITE-DWARF STARS ; ZZ CETI STARS ; STRUCTURAL PARAMETERS ; NONRADIAL PULSATORS ; DRIVING MECHANISM ; SPACED DATA ; ASTEROSEISMOLOGY ; DISCOVERY ; MISSION
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12204
Collection恒星物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorFu, Jian-Ning
Affiliation1.Department of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China
2.IRAP, Université de Toulouse, CNRS, UPS, CNES, 14 avenue Edouard Belin, F-31400, Toulouse, France
3.Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
4.School of Physical Sciences, University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, People's Republic of China
5.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, People's Republic of China
6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, People's Republic of China
Recommended Citation
GB/T 7714
Zong, Weikai,Charpinet, Stephane,Fu, Jian-Ning,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).
APA Zong, Weikai,Charpinet, Stephane,Fu, Jian-Ning,Vauclair, Gerard,Niu, Jia-Shu,&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).
MLA Zong, Weikai,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).
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