The autocorrelation function of stellar p‐mode measurements and its diagnostic properties
The autocorrelation function of stellar p‐mode measurements and its diagnostic properties
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DOI：
10.1111/j.1365-2966.2006.10396.x
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发表时间：
2006-07
影响因子：
4.8
通讯作者：
I. Roxburgh;I. Roxburgh;S. Vorontsov
中科院分区：
文献类型：
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作者：
I. Roxburgh;I. Roxburgh;S. Vorontsov
在不测量共振p模频率的情况下，可以从强度(或速度)观测的自相关函数(ACF)来分析恒星内部声波传播的基本特性。我们展示了如何通过ACF中的调制来测量恒星核中声波折射的强度，或前向声波幅度。这是支配所谓的“小频率间隔”的基本物理量，当数据质量不足以可靠地识别恒星的p模频率时，它从ACF的测量可以用来确定小频率间隔。
The basic properties of acoustic wave propagation in stellar interiors can be analysed from the autocorrelation function (ACF) of intensity (or velocity) observations without measuring the resonant p-mode frequencies. We show how the strength of acoustic wave refraction in the stellar core, or forward acoustic amplitude, can be measured from a modulation in the ACF. This is the basic physical quantity which governs the so-called ‘small frequency separations’, and its measurement from the ACF can be used for determining the small frequency separations when the data is of insufficient quality for a reliable identification of the stellar p-mode frequencies.