WES—Weihai Echelle Spectrograph

Gao, Dong-Yang and Ji, Hang-Xin and Cao, Chen and Hu, Shao-Ming and Wittenmyer, Robert A. and Hu, Zhong-Wen and Grupp, Frank and Kellermann, Hanna and Li, Kai and Guo, Di-Fu (2016) WES—Weihai Echelle Spectrograph. Publications of the Astronomical Society of the Pacific, 128 (970). ISSN 0004-6280


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 = l Dl 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≈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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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 16 Mar 2017 03:05
Last Modified: 06 Apr 2017 06:44
Uncontrolled Keywords: Weihai Echelle Spectrograph; performance
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/1538-3873/128/970/125002
URI: http://eprints.usq.edu.au/id/eprint/30641

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