WES-Weihai Echelle Spectrograph
WES-Weihai Echelle Spectrograph
复制标题
WES-威海阶梯光栅光谱仪
DOI：
10.1088/1538-3873/128/970/125002
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发表时间：
2016-12-01
影响因子：
3.5
通讯作者：
Guo, Di-Fu
中科院分区：
文献类型：
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作者：
Gao, Dong-Yang;Ji, Hang-Xin;Guo, Di-Fu
威海阶梯光栅光谱仪（WES）是我国第一台用于天文观测的光纤馈电阶梯光栅光谱仪。它主要用于附近明亮恒星的化学丰度和星震学研究，以及系外行星的径向速度 (RV) 检测。 WES 的光学设计基于广泛论证且行之有效的白瞳概念。我们详细描述了 WES 并展示了其性能的一些示例。单次曝光中阶梯光栅图像覆盖矩形 CCD 上 107 个光谱级的 371-1100 nm 光谱区域。通过将入口狭缝宽度从全像素采样调整到光纤出口处的 2.2 像素采样，光谱分辨率 R = lambda/Delta lambda 从 40,600 变为 57,000。极限星等缩放至 V = 8，一小时曝光时信噪比超过 100 in V，光谱分辨率 R 接近 40,000，威海天文台 1 m 望远镜的中值视宁度为 1 7。 WES 的 RV 测量精度估计为
The Weihai Echelle Spectrograph (WES) is the first fiber-fed echelle spectrograph for astronomical observation in China. It is primarily used for chemical abundance and asteroseismology studies of nearby bright stars, as well as radial velocity (RV) detections for exoplanets. The optical design of WES is based on the widely demonstrated and well-established white-pupil concept. We describe the WES in detail and present some examples of its performance. A single exposure echelle image covers the spectral region 371-1100 nm in 107 spectral orders over the rectangular CCD. The spectral resolution R = lambda/Delta lambda changes from 40,600 to 57,000 through adjusting the entrance slit width from full to 2.2 pixels sampling at the fiber-exit. The limiting magnitude scales to V = 8 with a signal-to-noise ratio of more than 100 in V for an hour exposure, at the spectral resolution R approximate to 40,000 in the median seeing of 1 7 at Weihai Observatory for the 1 m telescope. The RV measurement accuracy of WES is estimated to be