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NONPERIODIC VARIATIONS IN ASTROPHYSICAL SYSTEMS: INVESTIGATING FREQUENCY EVOLUTION

机译:天体物理系统的非周期性变化:研究频率演化

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摘要

We present a method related to the wavelet transform, the Gabor transform, for investigating astronomical time series containing nonconstant frequencies. Instances in which such data sets may arise include variable star light curves, numerical studies of the gravitational three-body problem, X-ray binaries, and signals from more exotic objects such as planets around pulsars and mass infall from accretion structures onto compact objects. As an illustration of its power, we apply the technique to a numerical data set of a gravitational three-body interaction and to photometry of the rapidly oscillating peculiar A star HD 60435. In the three-body example, the method provides an insightful shorthand that allows for the determination of episodes where the system behaves as two nearly Keplerian orbits. For HD 60435, the power in the main frequency exhibits unusual evolution over the duration of the observation.
机译:我们提出了一种与小波变换,Gabor变换有关的方法,用于研究包含非恒定频率的天文时间序列。可能出现此类数据集的实例包括可变星光曲线,引力三体问题的数值研究,X射线双星以及来自更奇特的物体(例如脉冲星周围的行星和从吸积结构到紧凑物体的质量落差)发出的信号。为了说明其功能,我们将该技术应用于重力三体相互作用的数值数据集以及快速振荡的奇异A star HD 60435的光度法。在三体示例中,该方法提供了一个有见地的速记可以确定系统表现为两个近似开普勒轨道的情节。对于HD 60435,在观察期间,主频率中的功率表现出不同寻常的变化。

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