郭守敬望远镜（LAMOST）亮月夜减天光的研究

It is important for the data reducing of the LAMOST to researching on the night sky, especially on the bright night sky. Because existing the distribution of the brightness of night sky on the space, the difference of the brightness can not be ignored for the large field telescopy. In some literature, models about the influence of the moon on the night sky are mentioned. One aim of this project is to find a suitable model for the LAMOST and to fix parameters of the model depending on the data observed by the LAMOST. In the project, we will also research how to restore the night sky background by interpolation and extrapolation the night sky data observed by LAMOST sky fiber under the model. Substracting the night sky data from the spectra of the target objects and the relation between night sky and the signal to noise of the spectra are also included in this project.

对于夜天光的研究，特别是亮月夜的夜天光研究，是郭守敬望远镜（LAMOST） 数据处理中所需要的。因为由于夜天光在空间尺度上存在着梯度的分布，对于大视场巡天望 远镜来说，这个梯度是不可以忽略的。关于月光对天空背景的影响，文献中提到过一些模型。 本项目的目的是在模型中选取适合郭守敬望远镜的，结合郭守敬望远镜实际的观测数据与观 测条件，对模型的参数进行适当的调整，以适合望远镜的需要。在项目中，还将研究如何利 用望远镜的天光光纤结合天光背景模型，对望远镜其他光纤背景进行还原的算法，和减天光 算法的研究，以及天光背景对光谱信噪比的影响。