A period investigation of two chromospherically active binary stars: RT Coronae Borealis and PW Herculis
文献类型：期刊论文
| 作者 | Qian SB(钱声帮)1,3 ; Zhu LY(朱俐颖)1,3; He JJ(何家佳)1,3; Boonruksar, S2
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| 刊名 | NEW ASTRONOMY
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| 出版日期 | 2003-07 |
| 卷号 | 8期号:5页码:457-463 |
| 关键词 | binaries : close stars : individual : RT CrB stars : individual : PW Her stars : late-type |
| ISSN号 | 1384-1092 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, United Lab Opt Astron, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RS CANUM-VENATICORUM ; ORBITAL PERIOD ; ECLIPSING BINARY ; CLOSE BINARIES ; RADIO-CONTINUUM ; EMISSION ; SYSTEMS ; MODULATION ; DRACONIS ; CATALOG |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.sciencedirect.com/science/article/pii/S1384107603000459 |
| 语种 | 英语 |
| WOS记录号 | WOS:000184662500008 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5764]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 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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来源：云南天文台
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