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Photometric studies for two contact binaries: V532 Monocerotis and GU Orionis
Yang, Yuangui1; Dai, Haifeng1; Yuan, Huiyu1; Zhang XL(张西亮)2; Zhang, Liyun3
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2017-08-01
Volume69Issue:4
DOI10.1093/pasj/psx049
Indexed BySCI
Keywordbinaries: close binaries: eclipsing stars: individual (V532 Monocerotis, GU Orionis)
Abstract

We present photometry and spectroscopy data for V532 Mon and GU Ori, observed in 2011 and 2016. From the spectral observations, the spectral types are determined to be F5V for V532 Mon and G0V for GU Ori. With the 2015-version Wilson-Devinney program, the photometric solutions are simultaneously deduced from VR light curves (LCs). The intrinsic variability for V532 Mon is found by comparing LCs in 2004 and 2011, while the asymmetric LCs for GU Ori are modeled by a cool spot on the more massive component. The results imply that the two stars are A-type contact binaries. The mass ratios and fill-out factors are, respectively, q = 0.190(+/- 0.006) and f = 43.7(+/- 0.9)% for V532 Mon and q = 0.455(+/- 0.020) and f = 26.9(+/- 1.3)% for GU Ori. From the (O - C) curves, it is found that their orbital periods may be undergoing long-term variations. The rates of period change are dP/dt = -1.72(+/- 0.05) x 10(-7) dyr(-1) for V532 Mon and dP/dt = +1.45(+/- 0.01) x 10(-7) dyr(-1) for GU Ori. V532 Mon with a decreasing period will evolve into a deep-contact binary, while GU Ori with an increasing period may evolve into a broken-contact case.

Funding ProjectNatural Science Foundation of China[11473009] ; Natural Science Foundation of China[U1231102] ; Natural Science Foundation of China[U1431114] ; Anhui Provincial Department of Education[KJ2017A850]
Funding Organizationbinaries: close ; binaries: eclipsing ; stars: individual (V532 Monocerotis, GU Orionis)
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0004-6264
URL查看原文
WOS IDWOS:000410491300012
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordURSAE MAJORIS SYSTEMS ; ECLIPSING BINARIES ; LIGHT CURVES ; VELOCITY CURVES ; STAR LIGHT ; CATALOG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11928
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorYang, Yuangui
Affiliation1.Information College/School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, Anhui Province, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.Department of Physics and Astronomy, College of Physics, Guizhou University, Guiyang 550025, China
Recommended Citation
GB/T 7714
Yang, Yuangui,Dai, Haifeng,Yuan, Huiyu,et al. Photometric studies for two contact binaries: V532 Monocerotis and GU Orionis[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2017,69(4).
APA Yang, Yuangui,Dai, Haifeng,Yuan, Huiyu,Zhang XL,&Zhang, Liyun.(2017).Photometric studies for two contact binaries: V532 Monocerotis and GU Orionis.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,69(4).
MLA Yang, Yuangui,et al."Photometric studies for two contact binaries: V532 Monocerotis and GU Orionis".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69.4(2017).
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