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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >A New Photometric Study for the Weak-Contact Binary V700 Cygni
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A New Photometric Study for the Weak-Contact Binary V700 Cygni

机译：弱接触二进制V700 Cygni的新光度研究

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摘要

We present a new charge-coupled device (CCD) photometry for the weak-contact binary V700 Cygni. From our light curves in the VR bands, a photometric solution was deduced by the 2003 version of the W-D program. The results show that V700 Cyg is a W-subtype binary with q = 0.5437(±0.0018) and f = 15.1%(±0.3%). The contributions of the third light to the total light are l_(3v) = 2.59%(±0.10%) and l_(3R) = 2.64%(±0.10%) for the VR bands, respectively. Based on all available light-minimum times from 1946 to 2008, a detailed period analysis reveals that there exists a long-term period increase with a periodic oscillation. This cyclic variation, with P3 = 54.0 (±2.0) yr, A = 0~d0185 (±0~d40012), and e' = 0.2117 (±0.0059) from equation (3), may result from a light-time effect via the third body, identified by the third light in the photometric solution. If an additional body exists, V700 Cyg may be a triple star system. This kind of tertiary component may remove angular momentum from the central system, which may play an important role in the formation and evolution of the binary. A continuous period increase at a rate of dP/dt = +0.33(±0.08) x 10-7d yr l can be interpreted as being mass transfer from the less-massive component to the more-massive one. With mass transferring, the orbital period increases and the separation between both components becomes wider. Finally, the contact configuration will break, as predicted by TRO theory. Therefore, this kind of weak-contact binary with a secular period increase will evolve into a broken-contact configuration.
机译：我们为弱接触二进制V700 Cygni提供了一种新的电荷耦合器件（CCD）光度法。根据VR波段中的光曲线，W-D程序的2003版推导出了光度学解决方案。结果表明，V700 Cyg是W型亚型二进制，q = 0.5437（±0.0018），f = 15.1％（±0.3％）。对于VR波段，第三光对总光的贡献分别为l_（3v）= 2.59％（±0.10％）和l_（3R）= 2.64％（±0.10％）。根据1946年至2008年所有可用的最短光时间，详细的周期分析显示存在一个周期性振荡的长期周期增加。根据P3 = 54.0（±2.0）yr，A = 0〜d0185（±0〜d40012），等式（3）的e'= 0.2117（±0.0059）的这种周期性变化可能是由于第三体，由光度学溶液中的第三种光识别。如果存在其他物体，则V700 Cyg可能是三星级系统。这种三次成分可以从中心系统中消除角动量，这可能在二元的形成和演化中起重要作用。连续周期以dP / dt = +0.33（±0.08）x 10-7d yr l的速率增加可以解释为从质量较差的组分到质量较强的组分的质量转移。随着质量传递，轨道周期增加，两个分量之间的间隔变宽。最终，如TRO理论所预测的，接触结构将破裂。因此，这种具有长期周期增加的弱接触二进制将演变为断开接触的构造。

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