DEEP, LOW-MASS RATIO OVERCONTACT BINARY SYSTEMS. XII. CK BOOTIS WITH POSSIBLE CYCLIC MAGNETIC ACTIVITY AND ADDITIONAL COMPANION

	DEEP, LOW-MASS RATIO OVERCONTACT BINARY SYSTEMS. XII. CK BOOTIS WITH POSSIBLE CYCLIC MAGNETIC ACTIVITY AND ADDITIONAL COMPANION
	Yang, YG1,2 ; Qian SB(钱声帮)2,3 ; Soonthornthum, B 4
刊名	ASTRONOMICAL JOURNAL
	2012-05
卷号	143 期号:5
关键词	binaries: close binaries: eclipsing stars: individual (CK Bootis)
ISSN号	0004-6256
通讯作者	Yang, YG (reprint author), Huaibei Normal Univ, Sch Phys & Elect Informat, Huaibei 235000, Anhui, Peoples R China.
产权排序	第三完成单位
英文摘要	We present precision CCD photometry, a period study, and a two-color simultaneous Wilson code solution of the short-period contact binary CK Bootis. The asymmetric light curves were modeled by a dark spot on the primary component. The result identifies that CK Boo is an A-type W UMa binary with a high fillout of f = 71.7(+/- 4.4)%. From the O-C curve, it is found that the orbital period changes in a complicated mode, i.e., a long-term increase with two sinusoidal variations. One cyclic oscillation with a period of 10.67(+/- 0.20) yr may result from magnetic activity cycles, which are identified by the variability of Max. I - Max. II. Another sinusoidal variation (i.e., A = 0.0131 days(+/- 0.0009 days) and P-3 = 24.16(+/- 0.64) yr) may be attributed to the light-time effect due to a third body. This kind of additional companion can extract angular momentum from the central binary system. The orbital period secularly increases at a rate of dP/dt = +9.79(+/- 0.80) x 10(-8) days yr(-1), which may be interpreted by conservative mass transfer from the secondary to the primary. This kind of deep, low-mass ratio overcontact binaries may evolve into a rapid-rotating single star, only if the contact configuration do not break down at J(spin) > (1/3)J(orb).
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]	CONTACT BINARIES ; ORBITAL PERIOD ; PHYSICAL PARAMETERS ; CLOSE BINARIES ; LIGHT CURVES ; STARS ; COMPONENTS ; VELOCITY ; SEARCH ; CYGNI
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-6256/143/5/122/meta
语种	英语
WOS记录号	WOS:000302954200019
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5869]
专题	云南天文台_双星与变星研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.School of Physics and Electronic Information, Huaibei Normal University, 235000 Huaibei, Anhui Province, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming, China 4.National Astronomical Research Institute of Thailand/Ministry of Science and Technology, Bangkok, Thailand
推荐引用方式 GB/T 7714	Yang, YG,Qian SB,Soonthornthum, B. DEEP, LOW-MASS RATIO OVERCONTACT BINARY SYSTEMS. XII. CK BOOTIS WITH POSSIBLE CYCLIC MAGNETIC ACTIVITY AND ADDITIONAL COMPANION[J]. ASTRONOMICAL JOURNAL,2012,143(5).
APA	Yang, YG,Qian SB,&Soonthornthum, B.(2012).DEEP, LOW-MASS RATIO OVERCONTACT BINARY SYSTEMS. XII. CK BOOTIS WITH POSSIBLE CYCLIC MAGNETIC ACTIVITY AND ADDITIONAL COMPANION.ASTRONOMICAL JOURNAL,143(5).
MLA	Yang, YG,et al."DEEP, LOW-MASS RATIO OVERCONTACT BINARY SYSTEMS. XII. CK BOOTIS WITH POSSIBLE CYCLIC MAGNETIC ACTIVITY AND ADDITIONAL COMPANION".ASTRONOMICAL JOURNAL 143.5(2012).