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Orbital period changes of YY Coronae Borealis

机译:YY日冕的轨道周期变化

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摘要

By using all available times of light minimum, the orbital period changes of a WUMa eclipsing binary YY CrB have been investigated. Two possible orbital period variations are found: (1) a secular period decrease with a rate of dP/dt=-6.727x10(-7) d yr(-1), on which a sinusoidal oscillation with a period of P=12.68 yr is superposed, or (2) an abrupt period change with a sudden period decrease of -0.7862 s around the year 2005. The secular period decrease is discussed in terms of (1) the mass transfer from the more massive companion to the less massive one with a mass transfer rate of dM(2)/dt=2.8096x10(-7) M-circle dot yr(-1), and (2) the mass loss via stellar wind from the system. The sinusoidal oscillatory can be interpreted as a result of the magnetic activity cycles of the system. In addition, the abrupt period decrease of the system might be due to the sudden mass transfer between the components.
机译:通过使用所有可用的最小光时间,已经研究了WUMa蚀双星YY CrB的轨道周期变化。发现两种可能的轨道周期变化:(1)世俗周期以dP / dt = -6.727x10(-7)d yr(-1)的速率减小,其上的正弦振动周期为P = 12.68 yr叠加,或者(2)突变的周期变化,在2005年前后突然下降了-0.7862 s。用(1)从较大质量的同伴向质量较小的同伴的质量转移来讨论长期变化。传质速率为dM(2)/dt=2.8096x10(-7)M圆点yr(-1),以及(2)来自系统的恒星风引起的质量损失。正弦振荡可以解释为系统磁活动周期的结果。另外,系统的突然周期减少可能是由于组件之间的突然质量传递所致。

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