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Gao, Dong-Yang; Ji, Hang-Xin; Cao, Chen; Hu, Shao-Ming; Wittenmyer, Robert A.; Hu, Zhong-Wen; Grupp, Frank; Kellermann, Hanna; Li, Kai and Guo, Di-Fu (2016): WES-Weihai Echelle Spectrograph. In: Publications of the Astronomical Society of the Pacific, Vol. 128, No. 970, 125002

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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 <10 m s(-1) in 10 months (302 days) and better than 15 m s(-1) in 4.4 years (1617 days) in the recent data processing.

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