NAOC Open IR
A newly discovered active contact binary in the field of NGC 1348
Fang Xiangsong1; Gu Shenghong1; Hui Hokeung2; ChiTai Kwok2; Yeung Bill3; KamCheung Leung3
2012
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume12Issue:1Pages:93
AbstractWe present a CCD photometry study of a newly discovered active eclipsing binary in the field of open cluster NGC 1348 based on the first time-series photometric observation.From the minimum times,we determined an orbital period of P = 0.691363 d.Among our datasets,the BV(RI)c light curves obtained in November 2008 were analyzed using the Wilson-Devinney light curve modeling technique.Because of the uncertainty of the membership of this binary in open cluster NGC 1348,we have analyzed the photometric data in two cases with different primary effective temperatures:Case A(T1 = 7750 K) and Case B(T1 = 5250 K).Our analyses reveal that,for Case A,it is a deep(f > 70%),very low mass ratio(q ■ 0.096) binary system,indicating that it is now in the late evolution stage of a contact binary;while for Case B,it is a red system with extraordinarily long orbital period with respect to the period-color relation for normal contact binaries,which suggests that this binary has evolved off the main sequence.The well known O’Connell effect(e.g.,△B■ 0.03 mag) was found in the dataset obtained in November 2008,which could be due to the existence of starspots on the components,therefore the corresponding spot properties(for Case A:hot spot;for Case B:dark spot) were determined using the Wilson-Devinney code.With the purpose of analyzing the dark spot activity for Case B,we compared the light curves derived in different observing runs,and found that a slight change appeared from November to December,2008,which indicates the evolution of spot activity on at least one component over a time scale of about one month.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/48019
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.Hokoon Nature Education cum Astronomical Centre
3.Hong Kong Astronomical Society
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Fang Xiangsong,Gu Shenghong,Hui Hokeung,et al. A newly discovered active contact binary in the field of NGC 1348[J]. Research in Astronomy and Astrophysics,2012,12(1):93.
APA Fang Xiangsong,Gu Shenghong,Hui Hokeung,ChiTai Kwok,Yeung Bill,&KamCheung Leung.(2012).A newly discovered active contact binary in the field of NGC 1348.Research in Astronomy and Astrophysics,12(1),93.
MLA Fang Xiangsong,et al."A newly discovered active contact binary in the field of NGC 1348".Research in Astronomy and Astrophysics 12.1(2012):93.
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