KM UMa: An Active Short-period Detached Eclipsing Binary in a Hierarchical Quadruple System

doi:10.3847/1538-4357/ad6df7

YNAO OpenIR > 双星与变星研究组

	KM UMa: An Active Short-period Detached Eclipsing Binary in a Hierarchical Quadruple System
	Meng FB(孟芳斌)1,2 ; Zhu LY(朱俐颖)1,2 ; Liu NP(刘念平)1 ; Li P(李平)1,2 ; Zhang J(张嘉)1 ; Li LJ(李临甲)1 ; Matekov, Azizbek1,2,3
发表期刊	ASTROPHYSICAL JOURNAL
	2024-10-01
卷号	974 期号:1
DOI	10.3847/1538-4357/ad6df7
产权排序	第1完成单位
收录类别	SCI
摘要	The first detailed photometric and spectroscopic analysis of the G-type eclipsing binary KM UMa is presented, which indicates that the system is a short-period detached eclipsing binary. The radial velocity curves were calculated using the cross-correlation function method based on Large Sky Area Multi-Object Fiber Spectroscopic Telescope, Sloan Digital Sky Survey, and our observations, which determined the mass ratio as q = 0.45 (+/- 0.04). Based on the light curves from the Transiting Exoplanet Survey Satellite, other survey data, and our multiband observations, the positive and negative O'Connell effects have been detected evolving gradually and alternately over the last 20 yr, which can be explained by the presence of spots on the primary component. A superflare event was detected in the SuperWASP data on 2007 February 28, further indicating that KM UMa is a very active system. We calculated its energy to be 5 x 1034 erg by assuming it occurred on the primary star. Utilizing hundreds of medium-resolution spectra and one low-resolution spectrum, the equivalent width variations of the H alpha line were calculated, indicating the presence of a 5.21 (+/- 0.67) yr magnetic activity cycle. The orbital period variations were analyzed using the O-C method, detecting a long-term decrease superimposed with a periodic variation. The amplitude of the cyclic variation is 0.01124 (+/- 0.00004) day, with a period of 33.66 (+/- 0.0012) yr, which exceeds the 5.21 yr activity cycle, suggesting that this is more likely attributable to the light travel time effect of a third body. Simultaneously, a visual companion has been detected based on the Gaia astrometric data, indicating that KM UMa is actually in a 2+1+1 hierarchical quadruple system.
资助项目	International Cooperation Projects of the National Key RD Program[2022YFE0127300]; Science Foundation of Yunnan Province[202401AS070046]; International Partership Program of Chinese Academy of Sciences[020GJHZ2023030GC]; Agency of innovative development under the Ministry of Higher Education, Science and Innovation of the Republic of Uzbekistan[AL-5921122128]; CAS'Light of West China' Program; Yunnan Revitalization Talent Support Program
项目资助者	International Cooperation Projects of the National Key RD Program[2022YFE0127300] ; Science Foundation of Yunnan Province[202401AS070046] ; International Partership Program of Chinese Academy of Sciences[020GJHZ2023030GC] ; Agency of innovative development under the Ministry of Higher Education, Science and Innovation of the Republic of Uzbekistan[AL-5921122128] ; CAS'Light of West China' Program ; Yunnan Revitalization Talent Support Program
语种	英语
学科领域	天文学 ; 恒星与银河系
文章类型	Article
出版者	IOP Publishing Ltd
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN	0004-637X
URL	查看原文
WOS记录号	WOS:001328731300001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ACTIVITY CYCLES ; LIGHT CURVES ; STARS ; MULTIPLICITY
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27636
专题	双星与变星研究组
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences (CAS), 650216, Kunming, People's Republic of China; [email protected]; 2.University of Chinese Academy of Sciences, No. 1 Yanqihu East Rd, Huairou District, 101408, Beijing, People's Republic of China; 3.Ulugh Beg Astronomical Institute, Uzbekistan Academy of Sciences, 33 Astronomicheskaya str., Tashkent, 100052, Uzbekistan
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Meng FB,Zhu LY,Liu NP,et al. KM UMa: An Active Short-period Detached Eclipsing Binary in a Hierarchical Quadruple System[J]. ASTROPHYSICAL JOURNAL,2024,974(1).
APA	孟芳斌.,朱俐颖.,刘念平.,李平.,张嘉.,...&Matekov, Azizbek.(2024).KM UMa: An Active Short-period Detached Eclipsing Binary in a Hierarchical Quadruple System.ASTROPHYSICAL JOURNAL,974(1).
MLA	孟芳斌,et al."KM UMa: An Active Short-period Detached Eclipsing Binary in a Hierarchical Quadruple System".ASTROPHYSICAL JOURNAL 974.1(2024).

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