进动不规则性对SS433短周期现象的影响

The Influence of Precession Instability on Short Period Variations of SS433

本文在文献［１］的基础上考虑进动不规则性，采用改进的阻尼正弦模型来计算ＳＳ４３３短周期变化的振幅、周期和多普勒频移残差分布轮廓的理论曲线，并将此曲线和残差分布轮廓作方差分析进行比较．结果表明：（１）在进动不规则性情形下，短周期变化的周期没有变化，振幅有微小变化；（２）理论曲线和残差分布轮廓吻合较好，这说明残差分布轮廓与进动不规则性有关；（３）短周期现象中的拍仍然存在，只不过受到不同程度的畸变影响.

Considering precession instability,the periods and amplitudes of the short period variations of SS433,and the theoretical curves of the residual distribution profile of Doppler shift have been calculated using the improved damped sinusoidal model.The curve and residual distribution profile have been compared in terms of variance analysis.We obtained:(1) In the case of precession instability,the periods do not change,the amplitudes change a little in the short period variations;(2) The theoretical curves coincide with the residual distribution profile well.It is shown that the residual distribution profile is related to the precession instability;(3) In phenomena of short period variations of SS433,the beats still exist but its profile has been deformed in different degree.