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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
发表期刊NEW ASTRONOMY
2003-07
卷号8期号:5页码:457-463
DOI10.1016/S1384-1076(03)00045-9
产权排序第1完成单位
收录类别SCI ; EI
关键词Binaries : Close Stars : Individual : Rt Crb Stars : Individual : Pw Her Stars : Late-type
摘要

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.

语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者ELSEVIER SCIENCE BV
出版地PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN1384-1092
URL查看原文
归档日期2003-09-17
WOS记录号WOS:000184662500008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Rs Canum-venaticorum ; Orbital Period ; Eclipsing Binary ; Close Binaries ; Radio-continuum ; Emission ; Systems ; Modulation ; Draconis ; Catalog
EI入藏号2003317574623
EI主题词Galaxies
EI分类号641.3mass Transfer - 657.2extraterrestrial Physics And Stellar Phenomena - 721.1computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 801chemistry - 931.1mechanics
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5764
专题双星与变星研究组
通讯作者Qian SB(钱声帮)
作者单位1.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)
推荐引用方式
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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