CORRECTING FOR TELLURIC ABSORPTION: METHODS, CASE STUDIES, AND RELEASE OF THE TelFit CODE
CORRECTING FOR TELLURIC ABSORPTION: METHODS, CASE STUDIES, AND RELEASE OF THE TelFit CODE
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纠正大地吸收：方法、案例研究和 TelFit 代码的发布
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Kraus
中科院分区：
文献类型：
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作者：
K. Gullikson;S. Dodson;A. Kraus
地面天文光谱在所有光谱区域都不同程度地受到地球大气的污染。我们给出了一个PYSON程序，它可以准确地将模型与天文数据中存在的大地吸收光谱相匹配，对于中等强的线，残差为连续谱的∼的3%-5%。我们通过对一颗几乎没有特征的A0V星HIP 20264的大地光谱以及819nm钠双星附近的一系列矮星M星光谱的拟合，证明了修正的质量。我们直接将结果与HIP 20264的经验大地校正进行比较，发现我们的模型拟合过程至少一样好，有时甚至更准确。我们向天文学团体免费提供的大地校正代码，可以用于许多目的的大地标准恒星观测的替代。
Ground-based astronomical spectra are contaminated by the Earth's atmosphere to varying degrees in all spectral regions. We present a Python code that can accurately fit a model to the telluric absorption spectrum present in astronomical data, with residuals of ∼3%–5% of the continuum for moderately strong lines. We demonstrate the quality of the correction by fitting the telluric spectrum in a nearly featureless A0V star, HIP 20264, as well as to a series of dwarf M star spectra near the 819 nm sodium doublet. We directly compare the results to an empirical telluric correction of HIP 20264 and find that our model-fitting procedure is at least as good and sometimes more accurate. The telluric correction code, which we make freely available to the astronomical community, can be used as a replacement for telluric standard star observations for many purposes.