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The highest rate orbital period increasing contact binary LP UMa revisited
Guo, D. -F.1; Li, K.1,2; Hu, S. -M.1; Jiang, Y. -G.1; Gao, D. -Y.1; Chen, X.1
Source PublicationNEW ASTRONOMY
2016-04
Volume44Pages:29-34
DOI10.1016/j.newast.2015.10.002
Indexed BySCI
KeywordStars: Binaries: Close Stars: Binaries: Eclipsing Stars: Individual (Lp Uma)
Abstract

Complete BV(RI)(c) photometry for the contact binary LP UMa was derived on 2015 February 23 using the 1.0 m telescope at Weihai Observatory of Shandong University. By compiling 66 newly determined times of light minimum with those published in the literature, we investigated the orbital period variation of this binary star. A possible cyclic variation, with a period of 14.84 years and an amplitude of 0.0031 days, was discovered to be superimposed on a long-term period increase (9.32 s century(-1)). The highest rate of orbital period increase was confirmed, which can be explained by the mass transfer from the less massive component to the more massive one. The cyclic period oscillation was possibly caused by the light travel time effect due to the presence of a third body. The multiple light curves were simultaneously analysed using the W-D program. It was found that LP UMa has a mass ratio of q = 0.331, a contact degree off = 7.9%, and the temperature difference between the two components was only about 90 K, which are quite different with the previous results. A hot spot on the primary component was employed to explain the asymmetric light curve of this binary.(C) 2015 Elsevier B.V. All rights reserved.

Funding ProjectNational Natural Science Foundation of China[11203016] ; National Natural Science Foundation of China[11333002] ; National Natural Science Foundation of China[U1431105] ; Basic Research Program of Shandong University at Weihai[2015ZQXM013] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201303]
Funding OrganizationNational Natural Science Foundation of China[11203016, 11333002, U1431105] ; Basic Research Program of Shandong University at Weihai[2015ZQXM013] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201303]
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
WOS IDWOS:000366069900005
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordURSAE MAJORIS SYSTEMS ; LIGHT CURVES ; STARS ; EVOLUTION ; CYGNI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9386
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, K.
Affiliation1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, China
Recommended Citation
GB/T 7714
Guo, D. -F.,Li, K.,Hu, S. -M.,et al. The highest rate orbital period increasing contact binary LP UMa revisited[J]. NEW ASTRONOMY,2016,44:29-34.
APA Guo, D. -F.,Li, K.,Hu, S. -M.,Jiang, Y. -G.,Gao, D. -Y.,&Chen, X..(2016).The highest rate orbital period increasing contact binary LP UMa revisited.NEW ASTRONOMY,44,29-34.
MLA Guo, D. -F.,et al."The highest rate orbital period increasing contact binary LP UMa revisited".NEW ASTRONOMY 44(2016):29-34.
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