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PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188
Chen, Xiaodian1,2,3; Deng, Licai3; De Grijs, Richard1,2,4; Zhang, Xiaobin3; Xin, Yu3; Wang, Kun3,5; Luo, Changqing3; Yan, Zhengzhou3,5; Tian, Jianfeng3; Sun, Jinjiang6; Liu, Qili6; Zhou, Qiang6; Luo, Zhiquan5
2016-11-01
Source PublicationASTRONOMICAL JOURNAL
Volume152Issue:5
AbstractWe used the newly commissioned 50 cm Binocular Network telescope at Qinghai Station of Purple Mountain Observatory (Chinese Academy of Sciences) to observe the old open cluster NGC 188 in V and R as part of a search for variable objects. Our time-series data span a total of 36 days. Radial velocity and proper-motion selection resulted in a sample of 532 genuine cluster members. Isochrone fitting was applied to the cleaned cluster sequence, yielding a distance modulus of (m - M)(V)(0) = 11.35 +/- 0.10 mag and a total foreground reddening of E(V - R) = 0.062 +/- 0.002 mag. Light-curve solutions were obtained for eight W Ursae Majoris eclipsing. binary systems (W UMas), and their orbital parameters were estimated. Using the latter parameters, we estimate a distance to the W UMas that is independent of the host cluster's physical properties. Based on combined fits to six of the W UMas (EP Cep, EQ Cep, ES Cep, V369 Cep, and-for the first time-V370 Cep and V782 Cep), we obtain an average distance modulus of (m - M)(V)(0) = 11.31 +/- 0.08 mag, which is comparable to. that resulting from our isochrone fits. These six W UMas exhibit an obvious period-luminosity relation. We derive more accurate physical parameters for the W UMa systems and discuss their initial masses and ages. The former show that these W UMa systems have likely undergone angular. momentum evolution within a convective envelope (W-type evolution). The ages of the W UMa systems agree well with the cluster's age.
SubtypeArticle
KeywordBinaries: Eclipsing Methods: Data Analysis Stars: Distances Open Clusters And Associations: Individual (Ngc 188 Berkeley 39)
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundation of China(11633005 ; National Natural Science Foundation of China(11633005 ; U1631102 ; U1631102 ; 11373010 ; 11373010 ; 11473037) ; 11473037) ; National Natural Science Foundation of China(11633005 ; National Natural Science Foundation of China(11633005 ; U1631102 ; U1631102 ; 11373010 ; 11373010 ; 11473037) ; 11473037)
DOI10.3847/0004-6256/152/5/129
WOS KeywordWIYN OPEN CLUSTER ; OLD OPEN CLUSTERS ; VARIABLE-STARS ; LUMINOSITY-RELATION ; ECLIPSING BINARIES ; CCD PHOTOMETRY ; LIGHT CURVES ; BERKELEY 39 ; NGC-188 ; EVOLUTION
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(11633005 ; National Natural Science Foundation of China(11633005 ; U1631102 ; U1631102 ; 11373010 ; 11373010 ; 11473037) ; 11473037) ; National Natural Science Foundation of China(11633005 ; National Natural Science Foundation of China(11633005 ; U1631102 ; U1631102 ; 11373010 ; 11373010 ; 11473037) ; 11473037)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000403827800005
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8829
Collection光学天文研究部
Affiliation1.Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China
2.Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
4.Int Space Sci Inst Beijing, 1 Nanertiao, Beijing 100190, Peoples R China
5.China West Normal Univ, Sch Phys & Elect Informat, Nanchong 637002, Peoples R China
6.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Chen, Xiaodian,Deng, Licai,De Grijs, Richard,et al. PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188[J]. ASTRONOMICAL JOURNAL,2016,152(5).
APA Chen, Xiaodian.,Deng, Licai.,De Grijs, Richard.,Zhang, Xiaobin.,Xin, Yu.,...&Luo, Zhiquan.(2016).PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188.ASTRONOMICAL JOURNAL,152(5).
MLA Chen, Xiaodian,et al."PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188".ASTRONOMICAL JOURNAL 152.5(2016).
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