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Orbital Period Investigation of Some Eclipsing CVs and pre-CVs
Qian SB(钱声帮)1; Soonthornthum, B2; Dai ZB(戴智斌)1; Zhu LY(朱俐颖)1; He JJ(何家佳)1; Liao WP(廖文萍)1; Li LJ(李临甲)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.

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
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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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