荷兰开放望远镜H $α$ Lyot滤波器的透射剖面
Transmission profile of the Dutch Open Telescope H$α$ Lyot filter
摘要：
Lyot滤波器的光谱透射轮廓的准确知识是重要的，特别是在比较观测与模拟数据。本文总结了有关DOT H $α$ Lyot滤波器的传输轮廓的可用事实，指出了光谱测量的无旁瓣高斯轮廓与DOT H $α$图像中寄生连续光可能泄漏的特征之间的差异。我们计算翼中心强度比产生的高斯卷积和平方的sinc函数与H $α$图集的配置文件，并比较它们与来自安静的太阳色球在磁盘中心的观测比。我们将预期和观察到的比值之间的差异以及DOT H $α$图像中可见的尖锐边缘解释为寄生连续光可能泄漏的指示。本文提出的方法也可应用于其它Lyot滤光片透射曲线的间接测试。我们建议两个理论传输配置文件的DOT H $α$ Lyot过滤器，应被视为最好的近似。结论性的答案只能通过对滤光片的光谱重新测量来给出。
英文摘要：
Accurate knowledge of the spectral transmission profile of a Lyot filter is important, in particular in comparing observations with simulated data. The paper summarizes available facts about the transmission profile of the DOT H$α$ Lyot filter pointing to a discrepancy between sidelobe-free Gaussian-like profile measured spectroscopically and signatures of possible leakage of parasitic continuum light in DOT H$α$ images. We compute wing-to-center intensity ratios resulting from convolutions of Gaussian and square of the sinc function with the H$α$ atlas profile and compare them with the ratios derived from observations of the quiet Sun chromosphere at disk center. We interpret discrepancies between the anticipated and observed ratios and the sharp limb visible in the DOT H$α$ image as an indication of possible leakage of parasitic continuum light. A method suggested here can be applied also to indirect testing of transmission profiles of other Lyot filters. We suggest two theoretical transmission profiles of the DOT H$α$ Lyot filter which should be considered as the best available approximations. Conclusive answer can only be given by spectroscopic re-measurement of the filter.
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