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Orbital period analysis of eclipsing post-novae T Aurigae: Evidence of magnetic braking and an unseen companion
Dai ZB(戴智斌)1,2,3; Qian SB(钱声帮)1,2; Dai, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊NEW ASTRONOMY
2010-04
卷号15期号:4页码:380-384
DOI10.1016/j.newast.2009.11.003
产权排序第1完成单位
收录类别SCI
关键词Stars: Cataclysmic Variables Stars: Binaries: Eclipsing Stars: Individual (t Aurigae) Stars: Magnetic Braking
摘要Four new CCD times of light minimum of T Aurigae are presented. The orbital period variation is analyzed by means of the standard O-C technique. The new times of light minimum indicate that a similar to 24 yr sine-like period variation superimposed on a secular orbital period decrease is obviously seen in the O-C diagram. However, the orbital period should increase because of mass transfer between components. In order to solve this apparent paradox. three possibilities including magnetic braking mechanism, which plays an important role in angular moment loss of binary, are proposed. The mass loss rate (M) over dot = 10(-10.4)M(circle dot) yr(-1) is derived by assuming that the Alfven radius of secondary is the same as that of the sun (i.e. R(A) similar or equal to 15R(circle dot)), Using the observational relationship Of (M) over dot(mb) - P(orb)(h) (McDermott and Taam, 1989; Rappaport et al., 1983), the Alfven radius of secondary is estimated as R(A) similar or equal to 1.9R(circle dot), which only requires a weak magnetic field in secondary. Since the brightness variations of T Aurigae caused by Applegate's mechanism need large energy beyond the total radiant energy in the time interval of 24 yr, the third body light travel-time effect is the most likely explanation for the 24-yr variation. The third body may be a brown-dwarf star in case of the high orbital inclination. (C) 2009 Elsevier B.V. All rights reserved.
项目资助者Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences, Yunnan Natural Science Foundation [2008CD157] ; Yunnan Natural Science Foundation [2005A0059M] ; Chinese Natural Science [10573032, 10573013, 10433030]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1384-1076
URL查看原文
归档日期2010-01-22
WOS记录号WOS:000274611200009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CATACLYSMIC VARIABLES ; ADDITIONAL TIMES ; U GEMINORUM ; EX HYDRAE ; BINARY ; HIBERNATION ; MINIMA
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5842
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Dai, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, PR China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PR China
3.Graduate School of the CAS, Beijing, PR China
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Dai ZB,Qian SB,Dai, ZB . Orbital period analysis of eclipsing post-novae T Aurigae: Evidence of magnetic braking and an unseen companion[J]. NEW ASTRONOMY,2010,15(4):380-384.
APA Dai ZB,Qian SB,&Dai, ZB .(2010).Orbital period analysis of eclipsing post-novae T Aurigae: Evidence of magnetic braking and an unseen companion.NEW ASTRONOMY,15(4),380-384.
MLA Dai ZB,et al."Orbital period analysis of eclipsing post-novae T Aurigae: Evidence of magnetic braking and an unseen companion".NEW ASTRONOMY 15.4(2010):380-384.
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