YNAO OpenIR  > 中国科学院天体结构与演化重点实验室
A new photometric study of the triple star system EF Draconis
Yang, Yuan-Gui1,2
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2012-04
Volume12Issue:4Pages:419-432
DOI10.1088/1674-4527/12/4/006
Indexed BySCI
KeywordStars (Including Multiple): Binaries: Close Stars: Individual (Ef Draconis)
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[10778707] ; National Natural Science Foundation of China[11133007] ; Anhui Provincial Natural Science Foundation[1208085MA04] ; Key Laboratory for the Structure and Evolution of Celestial Objects of CAS[OP 201110]
Funding OrganizationNational 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]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
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:000303278100006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCLOSE BINARY STARS ; RADIAL-VELOCITY ; CONTACT BINARY ; LIGHT CURVES ; EVOLUTION ; ORBITS ; CYGNI ; DEEP ; VI
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9433
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorYang, Yuan-Gui
Affiliation1.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
Recommended Citation
GB/T 7714
Yang, Yuan-Gui. 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.(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."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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