Photometric investigation of two contact binaries in the young open cluster NGC 957

	Photometric investigation of two contact binaries in the young open cluster NGC 957
	Luo, ChangQing1 ; Zhang, XiaoBin1 ; Deng, Licai1 ; Wang, Kun2 ; Luo, Yangping2 ; Fang, Xiangsong1
刊名	NEW ASTRONOMY
	2017-04-01
卷号	52 页码:29-34
关键词	Binaries: close - binaries: eclipsing Evolution - stars: Individual (V4 and V5 in NGC 957)
英文摘要	We present V- and R- band time-series CCD photometry of two contact binaries in the region of the young open cluster NGC 957. The two eclipsing binaries were discovered by Bukowiecki et al., 2009. OEJV 112, 1 and named as V4 and V5, respectively. In the present paper, the first detailed studies of the two contact binary systems are carried out. Firstly, based on the light curves, 28 times of minimum light were detected for V4 and 21 times of minimum light for V5, respectively. Secondly, the orbital periods of V4 and V5 were redetermined as P-V4 = 0.40032(5) days and P-V5 = 0.30752 (4)days, respectively. The photometric solutions were analyzed by using Wilson Decinny Code. The results reveal that both V4 and V5 are W UMa-type contact binaries with a degree of f(V4) = 31(+/- 1)% and f(V5) = 65(+/- 1)%. The mass ratios were determined to be q(V4) = 030 and q(V5) = 0.19. For V5, the well known O'Connell effect was detected in the dataset, which effect can be explained by employing a dark spot placed on the more massive primary component. Finally, based on the distances of the two contact binaries, which were calculated by using an relation given by Gettel et al., the two contact binaries are judged to be foreground stars in the open cluster NGC 957. (C) 2016 The Authors. Published by Elsevier B.V.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	PERIOD ECLIPSING BINARIES ; LIGHT CURVES ; STAR LIGHT ; VARIABLE-STARS ; FIELD ; CANDIDATES ; DISCOVERY ; NGC-188 ; CATALOG ; M67
收录类别	SCI
语种	英语
WOS记录号	WOS:000390514400005
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6818]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.China West Normal Univ, Phys & Space Sci Coll, Nanchong 637002, Peoples R China
推荐引用方式 GB/T 7714	Luo, ChangQing,Zhang, XiaoBin,Deng, Licai,et al. Photometric investigation of two contact binaries in the young open cluster NGC 957[J]. NEW ASTRONOMY,2017,52:29-34.
APA	Luo, ChangQing,Zhang, XiaoBin,Deng, Licai,Wang, Kun,Luo, Yangping,&Fang, Xiangsong.(2017).Photometric investigation of two contact binaries in the young open cluster NGC 957.NEW ASTRONOMY,52,29-34.
MLA	Luo, ChangQing,et al."Photometric investigation of two contact binaries in the young open cluster NGC 957".NEW ASTRONOMY 52(2017):29-34.