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; Li, K (reprint author), Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
发表期刊NEW ASTRONOMY
2016-04
卷号44页码:29-34
DOI10.1016/j.newast.2015.10.002
收录类别SCI
关键词Stars: Binaries: Close Stars: Binaries: Eclipsing Stars: Individual (Lp Uma)
摘要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.
项目资助者National 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)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1384-1076
URL查看原文
WOS记录号WOS:000366069900005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]URSAE MAJORIS SYSTEMS ; LIGHT CURVES ; STARS ; EVOLUTION ; CYGNI
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9386
专题中国科学院天体结构与演化重点实验室
通讯作者Li, K (reprint author), Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
作者单位1.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
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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..,...&Li, K .(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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