Two new R CMa-type eclipsing binaries containing a possible low-mass Helium white dwarf precursor: KIC 7368103 and KIC 8823397

doi:10.1093/mnras/stz1033

CORC > 国家天文台 > 中国科学院国家天文台

	Two new R CMa-type eclipsing binaries containing a possible low-mass Helium white dwarf precursor: KIC 7368103 and KIC 8823397
	Wang, Kun 1; Zhang, Xiaobin 2; Luo, Yangping 1; Luo, Changqing 2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-06-01
卷号	486 期号:2 页码:2462-2470
关键词	stars: binaries: eclipsing stars: individual (KIC 7368103, KIC 8823397) stars: variables: delta Scuti
ISSN号	0035-8711
DOI	10.1093/mnras/stz1033
英文摘要	We report the discovery of two new R CMa-type eclipsing binaries, each consisting of a possible low-mass Helium white dwarf precursor. Based on the Kepler long-cadence photometry and the radial-velocity measurements given by Matson et al., we determined comprehensive photometric solutions and physical parameters of two binaries KIC 7368103 and KIC 8823397. Light-curve modelling reveals that they are both short-period detached system with very low mass ratios q similar or equal to 0.1. The derived physical parameters show that the two binary systems consist of an extremely low-mass (similar or equal to 0.2 M-circle dot), oversized (>1 R-circle dot), and overluminous secondary component, accompanied by a less-evolved early A-type primary star. We therefore introduce KIC 7368103 and KIC 8823397 as two new R CMa-type binaries, which are probably evolving into EL CVn stars. After subtracting the synthetic eclipsing curve from the de-trended Kepler data, we carried out a preliminary frequency analysis of their light-curve residuals. KIC 7368103 was found to pulsate in 35 independent frequencies in the range from 14 to 31 d (1), which could be due to the intrinsic pulsations of the delta Sct-type primary star. However, no significant frequencies above the confidence level were detected in the binary KIC 8823397.
资助项目	China Scholarship Council ; Meritocracy Research Funds of China West Normal University[17YC515] ; Fundamental Research Funds of China West Normal University[17C051] ; Fundamental Research Funds of China West Normal University[16E016] ; National Natural Science Foundation of China (NSFC)[11833002] ; National Natural Science Foundation of China (NSFC)[11803050] ; NSFC[U1731111] ; Chinese Academy of Sciences[U1731111] ; Beijing Natural Science Foundation[1184018]
WOS关键词	DELTA-SCUTI STARS ; KEPLER ; PULSATION ; LIGHT ; EVOLUTION ; DISCOVERY ; ACCURACY ; ALGOL
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000474899400077
资助机构	China Scholarship Council ; China Scholarship Council ; Meritocracy Research Funds of China West Normal University ; Meritocracy Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Beijing Natural Science Foundation ; Beijing Natural Science Foundation ; China Scholarship Council ; China Scholarship Council ; Meritocracy Research Funds of China West Normal University ; Meritocracy Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Beijing Natural Science Foundation ; Beijing Natural Science Foundation ; China Scholarship Council ; China Scholarship Council ; Meritocracy Research Funds of China West Normal University ; Meritocracy Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Beijing Natural Science Foundation ; Beijing Natural Science Foundation ; China Scholarship Council ; China Scholarship Council ; Meritocracy Research Funds of China West Normal University ; Meritocracy Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; Fundamental Research Funds of China West Normal University ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Beijing Natural Science Foundation ; Beijing Natural Science Foundation
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27008]
专题	中国科学院国家天文台
通讯作者	Wang, Kun
作者单位	1.China West Normal Univ, Dept Astron, 1 Shida Rd, Nanchong 637002, Peoples R China 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Wang, Kun,Zhang, Xiaobin,Luo, Yangping,et al. Two new R CMa-type eclipsing binaries containing a possible low-mass Helium white dwarf precursor: KIC 7368103 and KIC 8823397[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,486(2):2462-2470.
APA	Wang, Kun,Zhang, Xiaobin,Luo, Yangping,&Luo, Changqing.(2019).Two new R CMa-type eclipsing binaries containing a possible low-mass Helium white dwarf precursor: KIC 7368103 and KIC 8823397.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,486(2),2462-2470.
MLA	Wang, Kun,et al."Two new R CMa-type eclipsing binaries containing a possible low-mass Helium white dwarf precursor: KIC 7368103 and KIC 8823397".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 486.2(2019):2462-2470.