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THE LATE K-TYPE BINARY V1104 HER NEAR THE SHORT-PERIOD END OF CONTACT BINARIES
Liu NP(刘念平)1,2,3; Qian SB(钱声帮)1,2,3; Soonthornthum, B4; Zhu LY(朱俐颖)1,2,3; Liao WP(廖文萍)1,2; Zhao EG(赵二刚)1,2; Zhou X(周肖)1,2; Liu, NP (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2015-04
卷号149期号:4
DOI10.1088/0004-6256/149/4/148
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (V1104 Her)
摘要V1104 Her is a newly discovered periodic variable with EW type variability. With an orbital period that is extremely short for a contact binary, it was found to have almost the latest K spectral type. To study its properties and nature, two new sets of multi-color light curves were analyzed with the Wilson-Devinney code. Photometric solutions reveal that the system is a W-type shallow contact binary with a mass ratio of 1/q=M-1/M-2=0.63. +/- 0.01 and a degree of contact of about f=15% +/- 2%. The real parameter uncertainties may be from three to five times larger, depending on the required confidence. Combining the newly determined times of minimum light, some of which were reprocessed from initial data, in conjunction with others published, the period variation is investigated in detail. Different methods of curve fitting were used, based on a weighted least-squares method. Finally, the orbital period of V1104 Her is found to be undergoing a long-term decrease at a rate of dP/dt = -2.9(+/- 0.5) x 10(-8) days . yr(-1), as well as double cyclic oscillations with a period ratio (T-1/T-2) very close to 9:2. The light-travel time effect was found to be the best explanation for the cyclic variations. This indicates that the object is a possible quadruple system, which further implies that multiplicity may be a common phenomenon among close binaries.
项目资助者Chinese Natural Science Foundation [11133007, 11325315] ; Science Foundation of Yunnan Province [2012HC011] ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences [XDB09010202]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2015-09-15
WOS记录号WOS:000352336800032
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]RW-COMAE BERENICES ; LIMB-DARKENING COEFFICIENTS ; LIGHT-CURVE ANALYSIS ; SKY AUTOMATED SURVEY ; ECLIPSING BINARIES ; QUADRUPLE SYSTEM ; RADIAL-VELOCITY ; CLOSE BINARIES ; STAR LIGHT ; ADDITIONAL COMPONENTS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5920
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Liu, NP (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.National Astronomical Research Institute of Thailand, 191 Siriphanich Bldg., Huay Kaew Road, Chiang Mai 50200, Bangkok, Thailand
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GB/T 7714
Liu NP,Qian SB,Soonthornthum, B,et al. THE LATE K-TYPE BINARY V1104 HER NEAR THE SHORT-PERIOD END OF CONTACT BINARIES[J]. ASTRONOMICAL JOURNAL,2015,149(4).
APA Liu NP.,Qian SB.,Soonthornthum, B.,Zhu LY.,Liao WP.,...&Liu, NP .(2015).THE LATE K-TYPE BINARY V1104 HER NEAR THE SHORT-PERIOD END OF CONTACT BINARIES.ASTRONOMICAL JOURNAL,149(4).
MLA Liu NP,et al."THE LATE K-TYPE BINARY V1104 HER NEAR THE SHORT-PERIOD END OF CONTACT BINARIES".ASTRONOMICAL JOURNAL 149.4(2015).
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