标题： ESpeRo：阶梯光谱仪罗真 显示英文标题

标题： ESpeRo: Echelle Spectrograph Rozhen

摘要： 本文我们描述了罗真国家天文台2米望远镜的阶梯光栅光谱仪。 该光谱仪是一个交叉色散、台式、光纤馈电的仪器，分辨率从$\sim$30000 到$\sim$45000。 在一个单独的图像中获得的光谱范围是从3900到9000{\AA }。 我们描述了光纤注入和导星单元、光谱仪本身以及探测器的参数。 列出了识别的阶数和相应的分辨本领。 讨论了通过使用更窄狭缝提高分辨率的可能性，并计算了相应的通量损失。 推导了不同亮度恒星组的预期信噪比。 简要描述了使用ESpeRo获得的一些初步结果。 显示英文摘要

摘要： In this paper we describe the echelle spectrograph of the 2 meter telescope of the Rozhen National Astronomical Observatory. The spectrograph is a cross-dispersed, bench-mounted, fiber-fed instrument giving a resolution from $\sim$30000 to $\sim$45000. The spectral range obtained in one single image is from 3900 to 9000 {\AA}. We describe the parameters of the fiber injection and the guiding unit, of the spectrograph itself, and of the detector. The identified orders and the resulting resolving power are presented. The opportunity to increase of the resolution by using a narrower slit is discussed and the corresponding loss of flux is calculated. The expected signal-to-noise ratio for a set of stars of different magnitudes was derived. Some of the first results obtained with ESpeRo are shortly described.