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PHOTOMETRIC STUDY OF THE VERY SHORT PERIOD SHALLOW CONTACT BINARY DD COMAE BERENICES
Zhu LY(朱俐颖)1,2; Qian SB(钱声帮)1,2; Mikulasek, Z3,4; Zejda, M3; Zverina, P3; Diethelm, R5; Zhu, L (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationASTRONOMICAL JOURNAL
2010-07
Volume140Issue:1Pages:215-223
DOI10.1088/0004-6256/140/1/215
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Eclipsing Stars: Evolution Stars: Individual (Dd Com)
AbstractThe first photometric solutions of the very short period (VSP) close binary DD Comae Berenices (P = 0(d).26920811) based on our new complete (IR)(C) light curves are derived by the 2003 version Wilson-Van Hamme code. They show that the system belongs to shallow contact W-type W UMa systems with a degree of overcontact of 8.7%. The observed light curve distortions are explained by employing the spots model due to the late-type nature of both components. We have collected all available photometric data about the system with emphasis on the individual observational data, which we treated simultaneously using our own method based on the usage of computed model light curves as templates. We recalculated published times of light minimum and added new ones of our own to construct an O-C diagram that spans over 70 years. Using a least squares method orthogonal quadratic model function, we found that the orbital period of DD Com is continuously increasing with (P) over dot = 0.00401(22) s yr(-1). The period increase may be caused by the mass transfer from the less-massive component to the more-massive one. With the period increase, the binary is evolving from the present shallow contact phase to the broken stage predicted by the thermal relaxation oscillation (TRO) theory. Compared with other VSP systems, DD Com is a rare system that lies on the expanding phase of the TRO cycle. Until now, only four such systems including DD Com are found in this stage. Thus, this target is another good observational proof of the TRO theory in a very short period region.
Funding OrganizationChinese Academy of Sciences ; West Light Foundation of the Chinese Academy of Sciences ; Chinese Natural Science Foundation [10973037, 10903026] ; Yunnan Natural Science Foundation [2008CD157] ; National Key Fundamental Research Project [2007CB815406]
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6256
URL查看原文
Archive Date2010-06-12
WOS IDWOS:000278691700020
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordURSAE MAJORIS SYSTEMS ; LIGHT CURVES ; STAR LIGHT ; ECLIPSING BINARY ; ORBITAL PERIOD ; TZ BOOTIS ; EVOLUTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5837
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 AuthorZhu, L (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.Department of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czech Republic
4.Observatory and Planetarium of J. Palisa, V?B?Technical University, Ostrava, Czech Republic
5.Bahnhofstrasse 3, CH-4118 Rodersdorf, Switzerland
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhu LY,Qian SB,Mikulasek, Z,et al. PHOTOMETRIC STUDY OF THE VERY SHORT PERIOD SHALLOW CONTACT BINARY DD COMAE BERENICES[J]. ASTRONOMICAL JOURNAL,2010,140(1):215-223.
APA Zhu LY.,Qian SB.,Mikulasek, Z.,Zejda, M.,Zverina, P.,...&Zhu, L .(2010).PHOTOMETRIC STUDY OF THE VERY SHORT PERIOD SHALLOW CONTACT BINARY DD COMAE BERENICES.ASTRONOMICAL JOURNAL,140(1),215-223.
MLA Zhu LY,et al."PHOTOMETRIC STUDY OF THE VERY SHORT PERIOD SHALLOW CONTACT BINARY DD COMAE BERENICES".ASTRONOMICAL JOURNAL 140.1(2010):215-223.
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