A HOLISTIC VIEW OF THE W UMA TYPE TY BOO
A HOLISTIC VIEW OF THE W UMA TYPE TY BOO
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DOI：
10.1088/0004-6256/144/5/149
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
P. Christopoulou;A. Papageorgiou;T. Vasileiadis;S. Tsantilas
中科院分区：
文献类型：
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作者：
P. Christopoulou;A. Papageorgiou;T. Vasileiadis;S. Tsantilas
对2010 - 2011年期间8个夜晚所获取的TY Boo的新型CCD四色光变曲线，与1969年至2011年获得的历史光变曲线进行了对比分析。所有光变曲线都可以用一种独特的几何结构以及两颗恒星中任一颗上双黑子模型的波长一致的光度参数来表示。经确认，TY Boo是一个浅度的W型相接双星系统，相接因子为\(f = 7.6\%(\pm0.8)\)。基于所有可用数据进行的周期研究显示出一种长期的减小（\(\frac{dP}{dt} = -3.65×10^{-8}\)天/年）以及一种振荡（\(P_3 = 58.9\)年，\(A = 0.0254\)天）。在不排除存在第三颗伴星的情况下，大量证据表明是活跃的周期性磁活动导致了黑子的形成，而非一颗未被观测到的伴星。两子星之间的物质转移以及角动量损失也被视为可能的机制。
New CCD four-color light curves of TY Boo made on eight nights over 2010–2011 were analyzed in comparison with historical light curves obtained from 1969 through 2011. The light curves could all be represented by a unique geometry and by wavelength consistent phototometric parameters of a two-spot model on either stellar component. It is confirmed that TY Boo is a shallow W-type contact binary system with a degree of contact factor of f = 7.6% (±0.8). A period investigation based on all available data shows a long-term decrease (dP/dt = −3.65 × 10−8 days yr−1) and an oscillation (P3 = 58.9 yr, A = 0.0254 days). Without ruling out the presence of a tertiary companion, the weight of evidence points to an active cyclic magnetic activity that causes spot formation rather than an unseen companion. Mass transfer between the components and angular momentum loss are also considered as possible mechanisms.