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Discovery of four W UMa type eclipsing binaries in the field of open cluster ASCC 5
Fang XS(房祥松)1,2,3; Gu SH(顾盛宏)1,2; Zhang, LY4; Pi, QF4; Fang, XS (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2013-09
卷号13期号:9页码:1052-1062
DOI10.1088/1674-4527/13/9/004
产权排序第1完成单位
收录类别SCI
关键词Stars:Binaries: Close Stars:Binaries: Eclipsing Stars: Spots
摘要We carried out time-series photometric observations in the R-c-band of the young, poorly studied open cluster ASCC 5 during November and December, 2012, to search for magnetically active stars, and discovered four eclipsing binary stars in this field. In order to characterize these four newly discovered binaries, we derived their orbital periods by their times of light minimum, estimated their effective temperatures based on their (J - H) colors and analyzed their light curves using the Wilson-Devinney light curve modeling technique. Our analyses reveal that all of them are contact binaries with short orbital periods of less than 0.5 d, with spectral types from late-F to mid-K. Among them, one is a typical A subtype contact binary with a mass ratio around 0.5 and a period of 0.44 d, and one is an H subtype contact binary with a high mass ratio around 0.9 and a short period of about 0.27 d. The other two systems show low amplitudes of light variation (A(Rc) <= 0.11(m)); their actual photometric mass ratios could not be determined by the light curve modelings, probably due to their attributes of being partially eclipsing stars. A preliminary analysis for these two systems indicates that both of them are likely to be W subtype contact binaries with low orbital inclinations. In addition, both of these two low amplitude variables show asymmetric distorted light curves (e.g., O'Connell effect of Delta R-c similar or equal to 0.02(m)) during the observing runs, suggesting the presence of starspots on these two systems. More interestingly, the one showing a large case of the O'Connell effect presented a remarkable variation in the shape of the light curve on a time scale of one day, indicating that this star is in a very active state. Therefore, these two stars need spectroscopic observations to precisely determine their parameters, as well as further photometric observations to understand the properties of their magnetic activity, e.g., the evolution of starspots.
项目资助者National Natural Science Foundation of China [10373023, 10773027, 11263001] ; National Aeronautics and Space Administration ; National Science Foundation
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:000323757800004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LIGHT CURVES ; STAR LIGHT ; MODELS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6792
专题系外行星研究组
中国科学院天体结构与演化重点实验室
通讯作者Fang, XS (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.College of Science / Department of Physics & NAOC-GZU-Sponsored Center for Astronomy Research, Guizhou University, Guiyang 550025, China
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Fang XS,Gu SH,Zhang, LY,et al. Discovery of four W UMa type eclipsing binaries in the field of open cluster ASCC 5[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(9):1052-1062.
APA Fang XS,Gu SH,Zhang, LY,Pi, QF,&Fang, XS .(2013).Discovery of four W UMa type eclipsing binaries in the field of open cluster ASCC 5.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(9),1052-1062.
MLA Fang XS,et al."Discovery of four W UMa type eclipsing binaries in the field of open cluster ASCC 5".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.9(2013):1052-1062.
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