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Photometric study of three ultrashort-period contact binaries
Liu L(刘亮)1,2,3,4; Qian SB(钱声帮)1,2,3,4; Fernandez Lajus, E.5,6; Essam, A.7; El-Sadek, M. A.7; Xiong X(熊逍)1,2,3,4; Liu, L.(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China)
发表期刊ASTROPHYSICS AND SPACE SCIENCE
2018
卷号363期号:1
DOI10.1007/s10509-017-3227-4
产权排序第1完成单位
收录类别SCI
关键词Binaries: Eclipsing Stars: Evolution Stars: Individuals (1swasp J030749.87-365201.7 1swasp J213252.93-441822.6 1swasp J200059.78-054408.9)
摘要We carried out high-precision photometric observations of three eclipsing ultrashort-period contact binaries (USPCBs). Theoretical models were fitted to the light curves by means of the Wilson-Devinney code. The solutions suggest that the three targets have evolved to a contact phase. The photometric results are as follows: (a) 1SWASP J030749.87-365201.7, q = 0.439 +/- 0.003, f = 0.0 +/- 3.6%; (b) 1SWASP J213252.93-441822.6, q = 0.560 +/- 0.003, f = 14.2 +/- 1.9%; (c) 1SWASP J200059.78+054408.9, q = 0.436 +/- 0.008, f = 58.4 +/- 1.8%. The light curves show O'Connell effects, which can be modeled by the assumed cool spots. The cool spots models are strongly supported by the night-to-night variations in the I -band light curves of 1SWASP J030749.87-365201.7. For a comparative study, we collected the whole set of 28 well-studied USPCBs with P < 0.24 day. Thus, we found that most of them (17 of 28) are in shallow contact (i.e. fill-out factors f < 20%). Only four USPCBs have deep fill-out factors (i.e.f > 50%). Generally, contact binaries with deep fill-out factors are going to merge, but it is believed that USPCBs have just evolved to a contact phase. Hence, the deep USPCB 1SWASP J200059.78+054408.9 seems to be a contradiction, making it very interesting. Particularly, 1SWASP J030749.87-365201.7 is a zero contact binary in thermal equilibrium, implying that it should be a turn-off sample as predicted by the thermal relaxation oscillation (TRO) theory.
项目资助者Yunnan Natural Science Foundation(2016FB004) ; young academic and technology leaders project of Yunnan Province(2015HB098) ; National Natural Science Foundation of China(11773066, 11403095, 11325315) ; Key Research Programme of the Chinese Academy of Sciences(KGZD-EW-603) ; Strategic Priority Research Programme "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09010202)
语种英语
学科领域天文学
文章类型Article
ISSN0004-640X
URL查看原文
WOS记录号WOS:000419213600009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SKY AUTOMATED SURVEY ; ECLIPSING BINARY ; ADDITIONAL COMPONENTS ; VELOCITY CURVES ; HK AQR ; STARS ; EVOLUTION ; SYSTEMS ; LIGHT ; SEARCH
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12199
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, L.(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China
4.University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
5.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina
6.Instituto de Astrofísica de La Plata (CCT La Plata-CONICET, UNLP), La Plata, Argentina
7.Department of Astronomy, National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt
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Liu L,Qian SB,Fernandez Lajus, E.,et al. Photometric study of three ultrashort-period contact binaries[J]. ASTROPHYSICS AND SPACE SCIENCE,2018,363(1).
APA Liu L.,Qian SB.,Fernandez Lajus, E..,Essam, A..,El-Sadek, M. A..,...&Liu, L..(2018).Photometric study of three ultrashort-period contact binaries.ASTROPHYSICS AND SPACE SCIENCE,363(1).
MLA Liu L,et al."Photometric study of three ultrashort-period contact binaries".ASTROPHYSICS AND SPACE SCIENCE 363.1(2018).
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