Photometric Investigation and Possible Light-Time Effect in the Orbital Period of a Marginal Contact System, CW Cassiopeiae
Photometric Investigation and Possible Light-Time Effect in the Orbital Period of a Marginal Contact System, CW Cassiopeiae
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边缘接触系统 CW Cassiopeiae 轨道周期的光度研究和可能的光时效应
DOI：
10.1093/pasj/62.2.457
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发表时间：
2010-04
影响因子：
2.3
通讯作者：
Jiang, Deng-Kai
中科院分区：
文献类型：
--
作者：
Jiang, Tian-Yu;Han, Zhan-Wen;Li, Li-Fang;Jiang, Deng-Kai
给出了一个被忽略的接触双星系统CW Cassiopeiae(CW Cas)在B带和V带的第一个完整的电荷耦合器件(CCD)光曲线。用Wilson和Devinney(WD)编码(1971，APJ，166,605)同时进行分析。光度解表明，CW Cas是一个质量比为m(2)/m(1)=2.234的W型WUMA体系，它处于边缘接触状态，接触度接近6.5%，两组分之间存在较大的温差，接近327K。根据从文献中收集到的最小时间，结合本研究获得的新时间，详细研究了CW Cas的轨道周期变化。结果表明，周期变化与其轨道周期的长期周期减小重叠。也可以解释为dp/dt=3.44×10(-8)dyyr(-1)的长期周期减小。通过质量较大的分量以dm(2)/dt=3.6×10(-8)M(圆点)yr(-1)的比率从质量较大的分量到质量较小的分量的质量传递，或通过磁制动线索磁恒星风的质量和角动量损失。周期T=63.7年的小幅度周期变化可能是由于第三物体的存在引起的光时效应引起的。
The first complete charge-coupled device (CCD) light curves in B and V passbands of a neglected contact binary system, CW Cassiopeiae (CW Cas), are presented. They were analyzed simultaneously by using the Wilson and Devinney (WD) code (1971, ApJ, 166, 605). The photometric solution indicates that CW Cas is a W-type W UMa system with a mass ratio of m(2)/m(1) = 2.234, and that it is in a marginal contact state with a contact degree of similar to 6.5% and a relatively large temperature difference of similar to 327 K between its two components. Based on the minimum times collected from the literature, together with the new ones obtained in this study, the orbital period changes of CW Cas were investigated in detail. It was found that a periodical variation overlaps with a secular period decrease in its orbital period. The long-term period decrease with a rate of dP/dt = 3.44 x 10(-8)d yr(-1) can be interpreted either. by mass transfer from the more-massive component to the less-massive with a rate of dm(2)/dt = 3.6 x 10(-8) M(circle dot) yr(-1), or by mass and angular-momentum losses through magnetic braking clue to a magnetic stellar wind. A low-amplitude cyclic variation with a period of T = 63.7 yr might be caused by the light-time effect due to the presence of a third body.
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影响因子：
3.5
作者：
S. Rucinski;H. Duerbeck
通讯作者：
S. Rucinski;H. Duerbeck
DOI：
10.1086/503871
发表时间：
2006-01
期刊：
The Astronomical Journal
影响因子：
--
作者：
T. Pribulla;S. Rucinski
通讯作者：
T. Pribulla;S. Rucinski
影响因子：
6.5
作者：
K. Stȩpień;J. Schmitt;W. Voges
通讯作者：
K. Stȩpień;J. Schmitt;W. Voges
DOI：
10.1111/j.1365-2966.2004.07761.x
发表时间：
2004-03
影响因子：
4.8
作者：
Lifang Li;Zhanwen Han;Fenghui Zhang
通讯作者：
Lifang Li;Zhanwen Han;Fenghui Zhang
影响因子：
4.8
作者：
J. A. Robertson;P. Eggleton
通讯作者：
J. A. Robertson;P. Eggleton