Orbital Period Investigation of Some Eclipsing CVs and pre-CVs | |
Qian SB(钱声帮)1![]() ![]() ![]() ![]() ![]() ![]() | |
会议录名称 | Astronomical Society of the Pacific (ASP) Conference Series - EIGHTH PACIFIC RIM CONFERENCE ON STELLAR ASTROPHYSICS: A TRIBUTE TO KAM-CHING LEUNG |
2009 | |
卷号 | 404 |
页码 | 248-254 |
会议录编者/会议主办者 | Soonthornthum, B; Komonjinda, S; Cheng, KS; Leung, KC |
产权排序 | 第1完成单位 |
收录类别 | CPCI |
会议名称 | 8th Pacific Rim Conference on Stellar Astrophysics |
会议日期 | 2008-05-05 |
会议地点 | Phuket, THAILAND |
会议赞助商 | Natl Astron Res Inst Thailand; Thailand Convent & Exhibit Bur; Int Astron Union |
摘要 | Orbital period variations of some eclipsing cataclysmic variable stars (e.g., SW Sex-type CVs) and pre-CVs (e.g., HW Vir-type binaries) were analyzed by including some new times of light minimum obtained with several small telescopes in the world. It is found that the orbital periods of most sample stars show a cyclic change while they undergo a long-term variation. The evidence of magnetic breaking (NIB) for fully convective star was given. Our investigation indicates that the evolution of CVs with period shorter than 3 hours may be also governed by NIB, which is in agreement with new period distribution of CVs and with the results that fully convective stars are very active, with strong and stable magnetic field. It is revealed that the treat of MB in the standard theory should be modified and in this way the "period minimum" problem can be solved. The long-term period changes and the relation between the orbital period and its rate of change (dP/dt) are discovered for SW Sex-type CVs. These results supported that SW Sex-type CVs have the highest luminosity among CVs and was the reason that results in the observed SW Sextantis phenomena. We show that the cyclic period variations can not be explained by the mechanism of magnetic activity cycles of the late type component because of the problem of energy. The light-travel time effect via the presence of a tertiary component is the most possible mechanism to interpret the periodic change. It is shown that the extremely low-mass objects (e.g., brown dwarf stars and huge planets) are usually encountered as a tertiary component in CVs and pre-CVs. |
项目资助者 | N/A |
语种 | 英语 |
学科领域 | 天文学 ; 天体物理学 ; 恒星与银河系 |
学科门类 | 理学 ; 理学::天文学 |
文章类型 | Proceedings Paper |
出版者 | ASTRONOMICAL SOC PACIFIC |
出版地 | 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA |
ISBN号 | 978-1-58381-685-1 |
URL | 查看原文 |
归档日期 | 2010-10-14 |
WOS记录号 | WOS:000271628900047 |
WOS研究方向 | Astronomy & Astrophysics |
WOS类目 | Astronomy & Astrophysics |
关键词[WOS] | Cataclysmic Variables ; Hw Virginis ; Stars |
引用统计 | |
文献类型 | 会议论文 |
条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5949 |
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, 650011, Kunming, China 2.National Astronomical Research Institute of Thailand, Ministry of Science and Technology, Chiang Mai 50200, Thailand |
推荐引用方式 GB/T 7714 | Qian SB,Soonthornthum, B,Dai ZB,et al. Orbital Period Investigation of Some Eclipsing CVs and pre-CVs[C]//Soonthornthum, B; Komonjinda, S; Cheng, KS; Leung, KC. 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA:ASTRONOMICAL SOC PACIFIC,2009:248-254. |
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