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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; Zhao EG(赵二刚), Email: zergang@ynao.ac.cn
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-05-01
卷号18期号:5
DOI10.1088/1674-4527/18/5/59
产权排序第1完成单位
收录类别SCI
关键词Binary (Including Multiple): Close Stars: Binaries: Eclipsing Stars: Early-type Stars: Evolution Stars: Individual (Bh Cen)
摘要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.
项目资助者National Natural Science Foundation of China(11325315)
语种英语
学科领域天文学
文章类型Article
ISSN1674-4527
URL查看原文
WOS记录号WOS:000432273900011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ORBITAL PERIOD MODULATION ; MASS-TRANSFER ; ECLIPSING BINARIES ; CONTACT BINARY ; CLOSE BINARIES ; CENTAURI ; SYSTEMS ; EVOLUTION ; MODELS
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12393
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Zhao EG(赵二刚), Email: zergang@ynao.ac.cn
作者单位1.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
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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,&Zhao EG.(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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