潮汐作用对Ba星系统轨道根数的影响

The Effect of Tides on Change of Orbital Elements of Barium Stars

用整个系统的角动量守恒条件代替切向动量守恒条件 ,考虑轨道偏心率的二次以上的高次项和潮汐作用的影响 ,重新推导了星风质量吸积和轨道根数变化方程 ,在新的轨道根数变化方程的基础上计算了Ba星的星风质量吸积及轨道根数的变化 ,并和没有潮汐作用的情况作了比较 .计算结果表明 ,潮汐作用使轨道周期较小的Ba星系统的能量减小 ,所以系统轨道的半长轴和轨道偏心率减小 ;潮汐作用对长周期的Ba星系统的影响很小 ;其大小依赖于恒星半径和 2星距离的比 .

Taking the total angular momentum conservation in place of tangential momentum conservation,and considering the square and higher power terms of orbital eccentricity e and effect of tidal interaction,the equations of changes of orbital elements of binaries are reduced for wind accretion scenario.These new equation of orbial elements are used to calculate the properties of barium stars,and compared the results with without tidal interaction.the results show that tidal friction diminishes the total energy of binaries systems with shorter orbital periods.This effect can be removed by considering only systems with period above 150?days.The degree of tidal interaction is dependent on the ratio of the stellar radius to the separation of the stars.