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A period investigation of two chromospherically active binary stars: RT Coronae Borealis and PW Herculis
Qian SB(钱声帮)1,3; Zhu LY(朱俐颖)1,3; He JJ(何家佳)1,3; Boonruksar, S.2
Source PublicationNEW ASTRONOMY
2003-07
Volume8Issue:5Pages:457-463
DOI10.1016/S1384-1076(03)00045-9
Contribution Rank第1完成单位
Indexed BySCI ; EI
KeywordBinaries : Close Stars : Individual : Rt Crb Stars : Individual : Pw Her Stars : Late-type
Abstract

Orbital period variations of two chromospherically active binary systems, RT CrB and PW Her, are presented. It is shown that the orbital period of RT CrB undergoes a cyclic oscillation with a period of 53.9 years. For PW Her, an alternate change, with a period of 42.7 years, is found to superimpose on a rapid secular increase (dP/dt = +3.53x10(-6) days/year). If the period oscillations of those two systems are caused by the light-time effect of a third body, the analysis for RT CrB indicates that the third body would be a low-mass main-sequence star, while, for PW Her, the mass of the third body should be no less than 7.8 M-circle dot. Since no spectral lines of the third body were seen in PW Her from the spectroscopic study by Popper [AJ 100 (1990) 247], if there is a third body in the system, it can only be a black hole. However, as both components in the two binary stars were showing strong chromospheric activity, the alternate period variations are more plausibly explained as the result of magnetic activity cycles. No secular period changes of RT CrB are found, which is in agreement with the detached evolved configuration of the system. The long-term period increase of PW Her may indicate that it is on an active phase of mass transfer (dm/dt = 2.17x10(-6) M-circle dot/year). (C) 2003 Elsevier B.V. All rights reserved.

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
PublisherELSEVIER SCIENCE BV
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN1384-1092
URL查看原文
Archive Date2003-09-17
WOS IDWOS:000184662500008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordRs Canum-venaticorum ; Orbital Period ; Eclipsing Binary ; Close Binaries ; Radio-continuum ; Emission ; Systems ; Modulation ; Draconis ; Catalog
EI Accession Number2003317574623
EI KeywordsGalaxies
EI Classification Number641.3mass Transfer - 657.2extraterrestrial Physics And Stellar Phenomena - 721.1computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 801chemistry - 931.1mechanics
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5764
Collection双星与变星研究组
Corresponding AuthorQian SB(钱声帮)
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, PR China
2.Astronomy Research Unit, Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
3.United Laboratory of Optical Astronomy, Chinese Academy of Science (ULOAC)
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Zhu LY,He JJ,et al. A period investigation of two chromospherically active binary stars: RT Coronae Borealis and PW Herculis[J]. NEW ASTRONOMY,2003,8(5):457-463.
APA Qian SB,Zhu LY,He JJ,&Boonruksar, S..(2003).A period investigation of two chromospherically active binary stars: RT Coronae Borealis and PW Herculis.NEW ASTRONOMY,8(5),457-463.
MLA Qian SB,et al."A period investigation of two chromospherically active binary stars: RT Coronae Borealis and PW Herculis".NEW ASTRONOMY 8.5(2003):457-463.
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