摘要
收集了近相接双星BF Vir 的光极小时刻,并对其轨道周期进行分析.结果表明该星的轨道周期在长期减小的同时也含有30 年的周期性变化.对引起轨道周期变化的各种物理机制的分析研究表明:一个质量为0 .281 M⊙、绕公共质心的轨道半径为10 .2 AU 的第3天体的存在能对轨道周期的周期性变化成份作出解释,如果轨道周期的周期性变化成份是由于次子星的周期性磁活动引起,那么系统总光度就应该有振幅0 .097 L⊙的周期性变化,且其变化周期与轨道周期变化的周期相同;轨道周期的长期减小成份可能是由于该系统质量和角动量损失引起.BF Vir 是一个短周期的近相接双星系统,通过长期的质量和角动量损失它将可能会演化成一个A 次型的相接双星.
All the published moments of light minima of the near contact binary BF Vir have been compiled and the changes of orbital period have been analyzed. It is shown that the period of the system may be oscillating with a period of 30 years while it undergoes a secular period decrease. The physical mechanisms of modulation of orbital period changes are investigated. The existence of a third body with mass 0.281M ⊙ and orbital radius 10.2AU may be used to interpret the period component of the orbital period. If this component is caused by the magnetic activity cycle in the secondary component, the luminosity of the system should exhibit a cyclical variation (ΔL rms =0.097L ⊙) with the same period as that of the periodic component. The secular period decrease may be caused by the mass and angular momentum losses of the system. BF Vir is a short period(P=0.6405761 days) near contact binary. It may evolve into an A type contact binary via secular mass and angular momentum losses.
出处
《天文学报》
CSCD
北大核心
2000年第1期36-43,共8页
Acta Astronomica Sinica
关键词
近相接双星
双星
轨道
周期变化
室女座
near contact binary, third body, magnetic activity, mass and angular momentum losses
