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The nature of EU Pegasi: An Algol-type binary with a delta Scuti-type component
Yang, Yuangui1; Yuan, Huiyu1; Dai, Haifeng1; Zhang XL(张西亮)2
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2018-03-01
Volume70Issue:2
DOI10.1093/pasj/psx159
Contribution Rank第2完成单位
Indexed BySCI
KeywordBinaries: Eclipsing Stars: Individuals (Eu Pegasi) Stars: Variables: Delta Scuti
Abstract

The comprehensive photometry and spectroscopy for the neglected eclipsing binary EU Pegasi are presented. We determine its spectral type to be A3V. With the W-D program, the photometric solution was deduced from the four-color light curves. The results imply that EU Peg is a detached binary with a mass ratio of q = 0.3105(+/- 0.0011), whose components nearly fill their Roche lobes. The low-amplitude pulsation occurs around the secondary eclipse, which may be attributed to the more massive component. Three frequencies are preliminarily explored by the Fourier analysis. The pulsating frequency at f(1) = 34.1 c d(-1) is a p-mode pulsation. The orbital period may be undergoing a secular decrease, superimposed by a cyclic variation. The period decreases at a rate of dP/dt = -7.34 +/- 1.06 d yr(-1), which may be attributed to mass loss from the system due to stellar wind. The cyclic oscillation, with P-mod = 31.0 +/- 1.4 yr and A = 0.0054 +/- 0.0010 d, may be caused by the light-time effect due to the assumed third body. With its evolution, the pulsating binary EU Peg will evolve from the detached configuration to the semi-detached case.

Funding ProjectNatural Science Foundation of China[11473009] ; Natural Science Foundation of China[U1231102] ; Natural Science Research Project of Anhui Provincial Department of Education[KJ2017A850]
Funding OrganizationNatural Science Foundation of China[11473009, U1231102] ; Natural Science Research Project of Anhui Provincial Department of Education[KJ2017A850]
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
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0004-6264
URL查看原文
WOS IDWOS:000432287600016
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordORBITAL PERIOD MODULATION ; ECLIPSING BINARIES ; VELOCITY CURVES ; CLOSE BINARIES ; STARS ; PULSATION ; CATALOG ; LIGHT ; TELESCOPE ; SYSTEMS
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12390
Collection丽江天文观测站(南方基地)
Corresponding AuthorYang, Yuangui; Yuan, Huiyu
Affiliation1.Information College/School of Physics and Electronic Information, Huaibei Normal University, Huaibei
2.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming
Recommended Citation
GB/T 7714
Yang, Yuangui,Yuan, Huiyu,Dai, Haifeng,et al. The nature of EU Pegasi: An Algol-type binary with a delta Scuti-type component[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2018,70(2).
APA Yang, Yuangui,Yuan, Huiyu,Dai, Haifeng,&Zhang XL.(2018).The nature of EU Pegasi: An Algol-type binary with a delta Scuti-type component.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,70(2).
MLA Yang, Yuangui,et al."The nature of EU Pegasi: An Algol-type binary with a delta Scuti-type component".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70.2(2018).
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