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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
通讯作者Wu, Tao(wutao@ynao.ac.cn)
发表期刊ASTROPHYSICAL JOURNAL
2018-11-01
卷号867期号:1页码:13
DOI10.3847/1538-4357/aadf85
产权排序第1完成单位
收录类别SCI
关键词asteroseismology stars: oscillations stars: interiors stars: fundamental parameters stars: individual (HD 50230, KIC 6462030, KIC 8324482, and KIC 10526294)
摘要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.
资助项目NSFC 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
项目资助者NSFC of China ; Yunnan Applied Basic Research Projects ; NASA's Science Mission Directorate
语种英语
学科领域天文学 ; 天体物理学 ; 恒星与银河系
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
ISSN0004-637X
URL查看原文
WOS记录号WOS:000448736000014
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GAMMA DORADUS STARS ; WHITE-DWARFS ; MODES ; ASTEROSEISMOLOGY
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/18320
专题恒星物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Wu T(吴涛)
作者单位1.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
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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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