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First four-color photometric investigation of extreme mass-ratio contact binary AS coronae borealis
Liu L(刘亮)1,2,3; Qian SB(钱声帮)1,2,3; Zhu LY(朱俐颖)1,2,3; Liao WP(廖文萍)1,2; He JJ(何家佳)1,2; Liu NP(刘念平)1,2
Source PublicationNEW ASTRONOMY
2017-02-01
Volume51Pages:1-6
DOI10.1016/j.newast.2016.08.003
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars: Binaries: Close Stars: Binaries: Eclipsing Stars: Individuals (As Coronae Borealis) Stars: Evolution
Abstract

The first high-precision BVRI light curves of the eclipsing binary AS CrB were presented and were analyzed by the 2015 version of the W-D code. It is found that AS CrB is an extreme mass-ratio, deep contact binary with a fill-out factor of f = 59.6 +/- 2.5% and a mass ratio of q = 0.172 +/- 0.008. Based on the photometric solution and the Dartmouth isochrones model, the masses, radii, and luminosities of the components are estimated as follows: M-1 = 1.25 +/- 0.15M(circle dot), M-2 = 0.21 +/- 0.06M(circle dot), R-1 = 1.40 +/- 0.07R(circle dot), R-2 = 0.67 +/- 0.04R(circle dot), L-1 = 3.2 +/- 0.2L(circle dot), and L-2 = 0.72 +/- 0.04L(circle dot), with an estimated distance 459 +/- 42 pc. These uncertainties mainly come from the errors of the color used to estimate the temperature of the primary star. By investigating all of the available times of light minima, it is found that the Observed-Calculated [(O - C)] curve shows a long-term period increase, with a rate of dP/dt = +(3.46 +/- 0.01) x 10(-7) day/year. As an extreme mass-ratio contact binary, AS CrB may merge into a single star, such as an FK Com-type star or a blue straggler, because of the orbital instability. (C) 2016 Elsevier B.V. All rights reserved.

Funding ProjectNational Natural Science Foundation of China [NSFC][11133007] ; National Natural Science Foundation of China [NSFC][11325315] ; National Natural Science Foundation of China [NSFC][11403095] ; Talent Project of Yunnan Province[2015HB098] ; Yunnan Natural Science Foundation[2016FB004] ; Yunnan Natural Science Foundation[2014FB187] ; Youth Innovation Promotion Association CAS
Funding OrganizationNational Natural Science Foundation of China [NSFC][11133007, 11325315, 11403095] ; Talent Project of Yunnan Province[2015HB098] ; Yunnan Natural Science Foundation[2016FB004, 2014FB187] ; Youth Innovation Promotion Association CAS
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherELSEVIER SCIENCE BV
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN1384-1076
URL查看原文
Archive Date2017-01-06
WOS IDWOS:000385595000001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordHIGH FILL-OUT ; OVERCONTACT BINARY ; ECLIPSING BINARY ; VELOCITY CURVES ; LIGHT CURVES ; STAR LIGHT ; CU-TAURI ; XY-BOO ; DEEP ; SYSTEMS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9746
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorLiu L(刘亮)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216 Kunming, P.R. China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650216 Kunming, P.R. China
3.University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, P.R. China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liu L,Qian SB,Zhu LY,et al. First four-color photometric investigation of extreme mass-ratio contact binary AS coronae borealis[J]. NEW ASTRONOMY,2017,51:1-6.
APA Liu L,Qian SB,Zhu LY,Liao WP,He JJ,&Liu NP.(2017).First four-color photometric investigation of extreme mass-ratio contact binary AS coronae borealis.NEW ASTRONOMY,51,1-6.
MLA Liu L,et al."First four-color photometric investigation of extreme mass-ratio contact binary AS coronae borealis".NEW ASTRONOMY 51(2017):1-6.
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