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MULTI-PERIOD G-MODE PULSATIONS OF A PRE-HE-WD STAR IN THE ECLIPSING BINARY KIC 9164561
Zhang, X. B.1; Fu, J. N.2; Li Y(李焱)3; Ren, A. B.2; Luo, C. Q.1
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2016-04-20
Volume821Issue:2
DOI10.3847/2041-8205/821/2/L32
Contribution Rank第3完成单位
Indexed BySCI
KeywordBinaries: Eclipsing Stars: Individual (Kic 9164561) Stars: Oscillations White Dwarfs
Abstract

We report the discovery of a new pulsating pre-He-WD in the EL CVn-type binary KIC 9164561. Light curve modeling and frequency analysis of the binary system were carried out based on short-cadence Kepler photometry. Combined with the radial-velocity solution, revised physical parameters of the binary system were determined. The component KIC 9164561B was confirmed to be a pre-He-WD star with M = 0.213 +/- 0.012M(circle dot), R = 0.283 +/- 0.006R(circle dot), and T-eff = 10650 +/- 200 K. In addition to the light changes due to an eclipse, pulsational light variations of the pre-He-WD star were detected. The Fourier analysis reveals at least 52 frequencies, with the dominant one at 313.4 mu Hz. A brief mode identification indicates that the pre-He-WD star pulsates in g-modes with an average period spacing of Delta Pi(l=1) = 80.87 s. Moreover, a number of multiplets due to rotational splitting were identified from the frequency spectra. The rotational period of the pulsating pre-He-WD star was found to equal to the orbital period, indicating that KIC 9164561B is in synchronous rotation.

Funding ProjectNational Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy[11373037] ; NSFC/CAS Joint Fund of Astronomy[U1231202] ; NSFC/CAS Joint Fund of Astronomy[U1331121] ; National Basic Research Program of China (973 program)[2014CB845700] ; National Basic Research Program of China (973 program)[2013BC8834900]
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy[11373037, U1231202, U1331121] ; National Basic Research Program of China (973 program)[2014CB845700, 2013BC8834900]
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
ISSN2041-8205
URL查看原文
WOS IDWOS:000374331900013
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordEXTREMELY LOW-MASS ; WHITE-DWARF STARS ; RED-GIANT STAR ; EVOLUTIONARY SEQUENCES ; LIGHT CURVES ; DISCOVERY ; PULSARS ; PERIOD ; FRAME
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9582
Collection恒星物理研究组
Corresponding AuthorZhang, X. B.
Affiliation1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China
2.Department of Astronomy, Beijing Normal University, Beijing, 100875, China
3.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, China
Recommended Citation
GB/T 7714
Zhang, X. B.,Fu, J. N.,Li Y,et al. MULTI-PERIOD G-MODE PULSATIONS OF A PRE-HE-WD STAR IN THE ECLIPSING BINARY KIC 9164561[J]. ASTROPHYSICAL JOURNAL LETTERS,2016,821(2).
APA Zhang, X. B.,Fu, J. N.,Li Y,Ren, A. B.,&Luo, C. Q..(2016).MULTI-PERIOD G-MODE PULSATIONS OF A PRE-HE-WD STAR IN THE ECLIPSING BINARY KIC 9164561.ASTROPHYSICAL JOURNAL LETTERS,821(2).
MLA Zhang, X. B.,et al."MULTI-PERIOD G-MODE PULSATIONS OF A PRE-HE-WD STAR IN THE ECLIPSING BINARY KIC 9164561".ASTROPHYSICAL JOURNAL LETTERS 821.2(2016).
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