Bimodal brightness oscillations in models of young binary systems
Bimodal brightness oscillations in models of young binary systems
复制标题
年轻双星系统模型中的双峰亮度振荡
DOI：
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发表时间：
2010
期刊：
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通讯作者：
V. Grinin
中科院分区：
文献类型：
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作者：
T. Demidova;N. Sotnikova;V. Grinin
我们考虑一个模型的周期性活动的年轻双星吸积物质的残余物的原恒星云。如果这样一个双星系统的轨道与视线成一个小角度，那么在环双星盘中激发的物质流和密度波可以从观测者那里屏蔽双星的主要成分。为了研究这些现象的SPH（光滑粒子流体动力学）方法，我们已经计算网格的流体动力学模型的基础上，我们已经构建的光变曲线作为一个功能的轨道相位的二元系统。主要的重点是调查的亮度振荡的性质。因此，模型参数在以下范围内变化：组分质量比q = M2：M1 = 0.2-0.5和偏心率= 0-0.7。定义二元粘度的参数也是变化的。我们采用了星周尘埃的典型光学颗粒特征。我们的计算表明，双峰振荡激发的双星偏心轨道，提供的二进制组件没有太大的差异，在质量。在这种情况下，双峰振荡的周期和振幅的比值以及它们的形状强烈地依赖于双星平面的倾角及其相对于观测者的取向。我们的分析表明，计算的光变曲线可以用来解释UX Ori星的周期活动。
We consider a model for the cyclic activity of young binary stars that accrete matter from the remnants of a protostellar cloud. If the orbit of such a binary system is inclined at a small angle to the line of sight, then the streams of matter and the density waves excited in the circumbinary disk can screen the primary component of the binary from the observer. To study these phenomena by the SPH (smoothed particle hydrodynamics) method, we have computed grids of hydrodynamic models for binary systems based on which we have constructed the light curves as a function of the orbital phase. The main emphasis is on investigating the properties of the brightness oscillations. Therefore, the model parameters were varied within the following ranges: the component mass ratio q = M2: M1 = 0.2–0.5 and the eccentricity = 0–0.7. The parameter that defined the binary viscosity was also varied. We adopted optical grain characteristics typical of circumstellar dust. Our computations have shown that bimodal oscillations are excited in binaries with eccentric orbits, provided that the binary components do not differ too much in mass. In this case, the ratios of the periods and amplitudes of the bimodal oscillations and their shape depend strongly on the inclination of the binary plane and its orientation relative to the observer. Our analysis shows that the computed light curves can be used in interpreting the cyclic activity of UX Ori stars.