A newly discovered active contact binary in the field of NGC 1348

	A newly discovered active contact binary in the field of NGC 1348
	Fang XS(房祥松)1,2,3 ; Gu SH(顾盛宏)1,2 ; Hui, HK 4; Kwok, CT 4; Yeung, B 5; Leung, KC 5
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2012-01
卷号	12 期号:1 页码:93-103
关键词	stars: binaries: close stars: binaries: eclipsing stars: spots
ISSN号	1674-4527
通讯作者	Fang, XS (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	We present a CCD photometry study of a newly discovered active eclipsing binary in the field of open cluster NGC 1348 based on the first time-series photometric observation. From the minimum times, we determined an orbital period of P = 0.691363 d. Among our datasets, the BV(RI)(c) light curves obtained in November 2008 were analyzed using the Wilson-Devinney light curve modeling technique. Because of the uncertainty of the membership of this binary in open cluster NGC 1348, we have analyzed the photometric data in two cases with different primary effective temperatures: Case A (T-1 = 7750 K) and Case B (T-1 = 5250K). Our analyses reveal that, for Case A, it is a deep (f > 70%), very low mass ratio (q similar or equal to 0.096) binary system, indicating that it is now in the late evolution stage of a contact binary; while for Case B, it is a red system with extraordinarily long orbital period with respect to the period-color relation for normal contact binaries, which suggests that this binary has evolved off the main sequence. The well known O'Connell effect (e.g., Delta B similar or equal to 0.03 mag) was found in the dataset obtained in November 2008, which could be due to the existence of starspots on the components, therefore the corresponding spot properties (for Case A: hot spot; for Case B: dark spot) were determined using the Wilson-Devinney code. With the purpose of analyzing the dark spot activity for Case B, we compared the light curves derived in different observing runs, and found that a slight change appeared from November to December, 2008, which indicates the evolution of spot activity on at least one component over a time scale of about one month.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LIGHT CURVES ; PHYSICAL PARAMETERS ; MASS-RATIO ; OPEN CLUSTERS ; STAR LIGHT ; SYSTEMS ; IDENTIFICATION ; PROGRAM ; MODELS ; DEEP
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/1674-4527/12/1/008/meta
语种	英语
WOS记录号	WOS:000300031300008
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5227]
专题	云南天文台_恒星物理研究组云南天文台_中国科学院天体结构与演化重点实验室
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.Graduate University of Chinese Academy of Sciences, Beijing 100049, China 4.Hokoon Nature Education cum Astronomical Centre, Sik Sik Yuen, Hong Kong, China 5.Hong Kong Astronomical Society, Hong Kong, China
推荐引用方式 GB/T 7714	Fang XS,Gu SH,Hui, HK,et al. A newly discovered active contact binary in the field of NGC 1348[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(1):93-103.
APA	Fang XS,Gu SH,Hui, HK,Kwok, CT,Yeung, B,&Leung, KC.(2012).A newly discovered active contact binary in the field of NGC 1348.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(1),93-103.
MLA	Fang XS,et al."A newly discovered active contact binary in the field of NGC 1348".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.1(2012):93-103.