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A New C-D-like Diagram for SPB Stars: The Variations of Period Spacing as a Signature of Evolutionary Status
Wu T(吴涛)1,2,3; Li Y(李焱)1,2,3,4; Deng ZM(邓真敏)1,2,4
Source PublicationASTROPHYSICAL JOURNAL
2018-11-01
Volume867Issue:1Pages:13
DOI10.3847/1538-4357/aadf85
Contribution Rank第1完成单位
Indexed BySCI
Keywordasteroseismology stars: oscillations stars: interiors stars: fundamental parameters stars: individual (HD 50230, KIC 6462030, KIC 8324482, and KIC 10526294)
Abstract

The slowly pulsating B-type (SPB) stars are the upper main-sequence stars on the HR diagram. Their oscillations are high-order, low-degree g-mode and can be used to probe the structure of the radiative zone near the outer boundary of the convective core and constrain the chemical mixing in stellar interiors. In SPB stars, the period spacing periodically varies with periods. It has been regarded as a signature of the chemical composition gradient beyond the convective core. Based on theoretical calculations, we find that the variation frequency of the period spacings (f(Delta P)) is related to the width of the mu-gradient region on the buoyancy radius (Lambda(mu)) with the relation of f(Delta P) similar to 0.5 Lambda(mu). This indicates that the variation frequency f(Delta P) is sensitive to the central hydrogen mass fraction X-C (i.e., the evolutionary status). Finally, we find that the variation frequency f(Delta P) and the means of the period spacings can be used to construct a new C-D-like diagram (f(Delta P) versus ), which can be used to roughly decide the stellar evolutionary stages and to approximately determine stellar mass for SPB stars.

Funding ProjectNSFC of China[11333006] ; NSFC of China[11503076] ; NSFC of China[11773064] ; NSFC of China[11521303] ; Yunnan Applied Basic Research Projects[2017B008] ; NASA's Science Mission Directorate
Funding OrganizationNSFC of China[11333006, 11503076,11773064, 11521303] ; Yunnan Applied Basic Research Projects[2017B008] ; NASA's Science Mission Directorate
Language英语
Subject Area天文学 ; 天体物理学 ; 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:000448736000014
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGAMMA DORADUS STARS ; WHITE-DWARFS ; MODES ; ASTEROSEISMOLOGY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/18320
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 AuthorWu T(吴涛)
Affiliation1.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
2.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
3.Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wu T,Li Y,Deng ZM. A New C-D-like Diagram for SPB Stars: The Variations of Period Spacing as a Signature of Evolutionary Status[J]. ASTROPHYSICAL JOURNAL,2018,867(1):13.
APA Wu T,Li Y,&Deng ZM.(2018).A New C-D-like Diagram for SPB Stars: The Variations of Period Spacing as a Signature of Evolutionary Status.ASTROPHYSICAL JOURNAL,867(1),13.
MLA Wu T,et al."A New C-D-like Diagram for SPB Stars: The Variations of Period Spacing as a Signature of Evolutionary Status".ASTROPHYSICAL JOURNAL 867.1(2018):13.
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