太阳双星18Sco的p模频率估算
Estimating the p-mode frequencies of the solar twin 18 Sco
摘要：
十多年来，太阳双胞胎一直是人们关注的焦点，因为它们的结构非常接近太阳。今天，由于有了高精度的光谱仪，利用星震学来探测它们的内部是可能的。我们的目标是使用从HARPS光谱仪获得的时间序列来提取最亮的太阳双星18 Sco的振荡频率。我们使用频谱分析的工具来估计这些量。我们使用MCMC算法估计52个频率。经过检查，他们的概率密度和直接MAP优化的结果比较，我们得到了一个最小的21个可靠的模式。每个脉动模式的识别是直接完成的，通过比较完善的太阳脉动模式。我们还利用这些值导出了一些基本的地震指标。这些结果提供了一个很好的基础，开始详细的地震分析18斯科使用恒星模型。
英文摘要：
Solar twins have been a focus of attention for more than a decade, because their structure is extremely close to that of the Sun. Today, thanks to high-precision spectrometers, it is possible to use asteroseismology to probe their interiors. Our goal is to use time series obtained from the HARPS spectrometer to extract the oscillation frequencies of 18 Sco, the brightest solar twin. We used the tools of spectral analysis to estimate these quantities. We estimate 52 frequencies using an MCMC algorithm. After examination of their probability densities and comparison with results from direct MAP optimization, we obtain a minimal set of 21 reliable modes. The identification of each pulsation mode is straightforwardly accomplished by comparing to the well-established solar pulsation modes. We also derived some basic seismic indicators using these values. These results offer a good basis to start a detailed seismic analysis of 18 Sco using stellar models.
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