A new photometric study of the triple star system EF Draconis
Yang, Yuan-Gui1,2; Yang, YG (reprint author), Huaibei Normal Univ, Sch Phys & Elect Informat, Huaibei 235000, Peoples R China.
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2012-04
卷号12期号:4页码:419-432
DOI10.1088/1674-4527/12/4/006
收录类别SCI
关键词Stars (Including Multiple): Binaries: Close Stars: Individual (Ef Draconis)
摘要We present new charge-coupled device (CCD) photometry for the triple star EF Draconis, obtained in 2009 and 2011. Using the updated Wilson-Devinney program, the photometric solutions were deduced from two sets of light curves. The results indicate that EF Dra is an A-type W UMa binary with a contact degree of f = 46.7%(+/- 0.6%) and a third light of l(3) similar or equal to 1.5%. Through analyzing the O - C curve, it is found that the orbital period shows a long-time increase with a light-time orbit. The period, semi-amplitude and eccentricity of the third body are P-inod = 17.20(+/- 0.18) yr, A = 0.0039(d)(+/- 0.0002(d)) and e = 0.49(+/- 0.02) respectively. This kind of tertiary companion may extract angular momentum from the central system. The orbital period of EF Dra secularly increases at a rate of dP/dt = +3.72(+/- 0.07) x 10(-7) d yr(-1), which may be interpreted by mass transfer from the less massive to the more massive component. As period increases, the separation between components may increase, which will cause the contact degree to decrease. With mass transferring, the spin angular momentum will increase, while the orbital angular momentum will decrease. Only if the contact configuration would merge at J(spin) > 1/3 J(orb) could this kind of deep-contact binary with period increasing, such as EF Dra, evolve into a rapidly-rotating single star.
项目资助者National Natural Science Foundation of China(10778707,11133007) ; Anhui Provincial Natural Science Foundation(1208085MA04) ; Key Laboratory for the Structure and Evolution of Celestial Objects of CAS(OP 201110)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1674-4527
URL查看原文
WOS记录号WOS:000303278100006
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CLOSE BINARY STARS ; RADIAL-VELOCITY ; CONTACT BINARY ; LIGHT CURVES ; EVOLUTION ; ORBITS ; CYGNI ; DEEP ; VI
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9433
专题中国科学院天体结构与演化重点实验室
通讯作者Yang, YG (reprint author), Huaibei Normal Univ, Sch Phys & Elect Informat, Huaibei 235000, Peoples R China.
作者单位1.School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
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Yang, Yuan-Gui,Yang, YG . A new photometric study of the triple star system EF Draconis[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(4):419-432.
APA Yang, Yuan-Gui,&Yang, YG .(2012).A new photometric study of the triple star system EF Draconis.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(4),419-432.
MLA Yang, Yuan-Gui,et al."A new photometric study of the triple star system EF Draconis".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.4(2012):419-432.
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