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Interior structura variations in the secondary components of two Algol-type eclipsing binary systems: SW Cygni and RR Draconis
Qian SB(钱声帮)1,2; Zhu LY(朱俐颖)1,2; Boonrucksar, S3; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMY & ASTROPHYSICS
2002-12
卷号396期号:2页码:609-613
DOI10.1051/0004-6361:20021387
产权排序第1完成单位
收录类别SCI ; EI
关键词Stars : Binaries : Close Stars : Individual : Sw Cyg Stars : Individual : Rr Dra Stars : Evolution
摘要SW Cyg and DD Dra are two Algol-type eclipsing binary systems. Both contain an A2-type main-sequence primary and a K0-type secondary component with a rather deep primary light minimum in their light curves (2.(m)6 and 3.(m)8, respectively). In the present paper, orbital period changes of these stars are studied based on the analyses of their century-long times of light minimum. Several period jumps are found to superimpose on a rapid secular increase (dP/dt = +4.71x10(-6) and +4.24x10(-6) days/year, respectively). Since the period increases are rather rapid, the mass exchange between the components would be dynamical. SW Cyg is a low-mass ratio system (q=0.20) and it is expected that the mass ratio of RR Dra may also be very low because of the rather deep primary eclipse minimum. The rapid period increases suggest that a rapid mass transfer also occurs in a low-mass ratio Alogl-type close binary which is opposite to the theoretically evolutionary scheme of the binary star. The period jumps superimposed on the long-term increases are caused by the structura variation of the cool mass-loser via instabilities in the convective outer layer (COL) or via cyclic magnetic activity of the K0-type components. As the period jumps do not occur in a short-term alternating way, the structura change caused by instabilities in the COL via a dynamical mass loss from the cool subgiant may be more plausible.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6361
URL查看原文
归档日期2003-01-08
WOS记录号WOS:000179574300024
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ALTERNATE PERIOD CHANGES ; CLOSE BINARIES
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5752
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, PR China
2.United Laboratory of Optical Astronomy, Chinese Academy of Science (ULOAC), PR China
3.Astronomy Research unit, Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
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Qian SB,Zhu LY,Boonrucksar, S,et al. Interior structura variations in the secondary components of two Algol-type eclipsing binary systems: SW Cygni and RR Draconis[J]. ASTRONOMY & ASTROPHYSICS,2002,396(2):609-613.
APA Qian SB,Zhu LY,Boonrucksar, S,&Qian, SB .(2002).Interior structura variations in the secondary components of two Algol-type eclipsing binary systems: SW Cygni and RR Draconis.ASTRONOMY & ASTROPHYSICS,396(2),609-613.
MLA Qian SB,et al."Interior structura variations in the secondary components of two Algol-type eclipsing binary systems: SW Cygni and RR Draconis".ASTRONOMY & ASTROPHYSICS 396.2(2002):609-613.
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