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RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?
Qian SB(钱声帮)1,2; He JJ(何家佳)1,2; Xiang, FY3; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2008
Volume60Issue:1Pages:77-83
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars : Binaries : Close Stars : Binaries : Eclipsing Stars : Individual (Rt Leonis Minoris)
AbstractNew photometric observations and analyses of the W UMa-type binary system RT Leonis Minoris are presented. A period study with our four times of light minimum, including other eclipse times from the literature, suggests that the orbital period of the binary star is variable. The O - C curve can be explained as a cyclic variation with an amplitude of 0.(d)0049 and a period of 46.7 yr. Photometric solutions were derived by using the 2003 version of the Wilson-Devinney method (1971, ApJ, 166, 605), and absolute parameters of the system were determined. The results indicate that RT LMi is an ambiguous W UMa-type overcontact system for the following reasons: (i) the depths of both minima are nearly equal, which makes it very difficult to distinguish whether it belongs to an A- or W-type system; (ii) the primary minima in Hoffmann's light curves are an occultation, indicating a W-type system, while the primary minimum in our light curve is a transit, suggesting an A-type light variation; and (iii) though our light curve shows an A-type variation, the photometric solutions indicate a higher secondary temperature of T-2 = 6513 K (T-1 = 6400 K), making the binary system, surprisingly, of W-type. These may indicate that Binnendijk's classification based on the shape of the light curve cannot reveal the physical properties of W UMa-type binary stars of this kind.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6264
URL查看原文
Archive Date2008-03-13
WOS IDWOS:000255818000008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordORBITAL PERIOD MODULATION ; URSAE-MAJORIS SYSTEM ; LIGHT VARIATION ; CLOSE BINARIES ; STARS ; DEEP ; M67
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5814
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, P. R. China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), Beijing 100012, P. R. China
3.Department of Physics, Xiangtan University, Xiangtan 411105, Funan Province, P. R. China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,He JJ,Xiang, FY,et al. RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2008,60(1):77-83.
APA Qian SB,He JJ,Xiang, FY,&Qian, SB .(2008).RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,60(1),77-83.
MLA Qian SB,et al."RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 60.1(2008):77-83.
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