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A Pre-main-sequence gamma Dor-delta Sct Hybrid with Extremely Slow Internal Rotation in a Short-period Eclipsing Binary KIC 9850387 Revealed by Asteroseismology
Zhang, Xiaobin1; Chen, Xinghao2; Zhang, Haotong1; Fu, Jianning3; Li, Yan2
2020-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume895Issue:2Pages:12
AbstractA complete understanding of the formation process of close binaries relies on the reliable determination of their masses and ages, as well as the interior structure of pre-main-sequence (PMS) binaries. PMS eclipsing binaries containing stellar oscillations are therefore benchmarks since the binarity makes it possible to measure the masses and radii independently with great accuracy, while stellar oscillations represent a unique method of probing stellar interiors. Here we report the discovery of KIC 9850387, a short-period PMS eclipsing binary exhibiting hybrid gamma Dor-delta Sct pulsations that is also the inner binary of a probable hierarchical triple system. From the light-curve and radial-velocity modeling we determine the masses and radii of the component stars, which suggest the probable PMS nature of the system. Based on four years of Kepler data, the intrinsic oscillations of the star are analyzed. The pulsation spectrum shows 17 low-frequency peaks spaced at exactly equidistant periods that are identified as dipole gravity modes. The practically constant period spacing indicates an extremely slow near-core rotation of the pulsator with a period deduced to be longer than 1 yr. This enables us to fit the pulsation frequencies precisely with non-rotating models. The stellar parameters yielded by asteroseismology modeling are in consistent with the dynamic ones given by the binary model. The results indicate that the pulsator is a young PMS star with an age between 6.4 and 7.1 Myr. KIC 9850387 is therefore the first PMS eclipsing binary identified by asteroseismology.
KeywordEclipsing binary stars Pre-main sequence stars Stellar oscillations Stellar rotation Stellar interiors
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants
DOI10.3847/1538-4357/ab8ad5
WOS KeywordDORADUS PULSATORS ; STAR LIGHT ; SCUTI ; INCLINATION ; SPACINGS ; STELLAR ; STRIP ; CORE
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants[11973053] ; NSFC/CAS Joint Fund of Astronomy through grants[11833002] ; NSFC/CAS Joint Fund of Astronomy through grants[U1731111] ; NSFC/CAS Joint Fund of Astronomy through grants[11673003]
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC/CAS Joint Fund of Astronomy through grants ; NSFC/CAS Joint Fund of Astronomy through grants
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000540537800001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/83176
Collection中国科学院国家天文台
Corresponding AuthorZhang, Xiaobin
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Yunnan, Peoples R China
3.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xiaobin,Chen, Xinghao,Zhang, Haotong,et al. A Pre-main-sequence gamma Dor-delta Sct Hybrid with Extremely Slow Internal Rotation in a Short-period Eclipsing Binary KIC 9850387 Revealed by Asteroseismology[J]. ASTROPHYSICAL JOURNAL,2020,895(2):12.
APA Zhang, Xiaobin,Chen, Xinghao,Zhang, Haotong,Fu, Jianning,&Li, Yan.(2020).A Pre-main-sequence gamma Dor-delta Sct Hybrid with Extremely Slow Internal Rotation in a Short-period Eclipsing Binary KIC 9850387 Revealed by Asteroseismology.ASTROPHYSICAL JOURNAL,895(2),12.
MLA Zhang, Xiaobin,et al."A Pre-main-sequence gamma Dor-delta Sct Hybrid with Extremely Slow Internal Rotation in a Short-period Eclipsing Binary KIC 9850387 Revealed by Asteroseismology".ASTROPHYSICAL JOURNAL 895.2(2020):12.
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