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New CCD photometric investigation of the early-type overcontact binary BH Cen in the young star-forming Galactic cluster IC 2944
Zhao EG(赵二刚)1,2,3,4; Qian SB(钱声帮)1,2,3,4; Zejda, Miloslav5; Zhang B(张斌)1,2,3,4; Zhang J(张嘉)1,2,3
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-05-01
Volume18Issue:5
DOI10.1088/1674-4527/18/5/59
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinary (Including Multiple): Close Stars: Binaries: Eclipsing Stars: Early-type Stars: Evolution Stars: Individual (Bh Cen)
Abstract

BH Cen is a short-period early-type binary with a period of 0.792(d) in the extremely young star-forming cluster IC 2944. New multi-color CCD photometric light curves in U, B, V, R and I bands are presented and are analyzed by using the Wilson-Devinney code. It is detected that BH Cen is a high-mass-ratio overcontact binary with a fill-out factor of 46.4 % and a mass ratio of 0.89. The derived orbital inclination i is 88.9 degrees, indicating that it is a totally eclipsing binary and the photometric parameters can be determined reliably. By adding new eclipse times, the orbital period changes in the binary are analyzed. It is confirmed that the period of BH Cen shows a long-term increase while it undergoes a cyclic oscillation with an amplitude of A(3) = 0.024 d and a period of P-3 = 50.3 yr. The high mass ratio, overcontact configuration and long-term continuous increase in the orbital period all suggest that BH Cen is in the evolutionary state after the shortest-period stage of Case A mass transfer. The continuous increase in period can be explained by mass transfer from the secondary component to the primary one at a rate of ((M) over dot)(2) = 2.8 x 10(-6) M-circle dot per year. The cyclic change can be plausibly explained by the presence of a third body because both components in the BH Cen system are early-type stars. Its mass is determined to be no less than 2.2 M-circle dot at an orbital separation of about 32.5 AU. Since no third light was found during the photometric solution, it is possible that the third body may be a candidate for a compact object.

Funding ProjectNational Natural Science Foundation of China[11325315]
Funding OrganizationNational Natural Science Foundation of China[11325315]
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
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000432273900011
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordORBITAL PERIOD MODULATION ; MASS-TRANSFER ; ECLIPSING BINARIES ; CONTACT BINARY ; CLOSE BINARIES ; CENTAURI ; SYSTEMS ; EVOLUTION ; MODELS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12393
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorZhao EG(赵二刚)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100101, China
4.University of Chinese Academy of Sciences, Beijing 100049, China
5.Department of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czech Republic
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhao EG,Qian SB,Zejda, Miloslav,et al. New CCD photometric investigation of the early-type overcontact binary BH Cen in the young star-forming Galactic cluster IC 2944[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(5).
APA Zhao EG,Qian SB,Zejda, Miloslav,Zhang B,&Zhang J.(2018).New CCD photometric investigation of the early-type overcontact binary BH Cen in the young star-forming Galactic cluster IC 2944.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(5).
MLA Zhao EG,et al."New CCD photometric investigation of the early-type overcontact binary BH Cen in the young star-forming Galactic cluster IC 2944".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.5(2018).
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