Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002exa....13...59h&link_type=abstract
Experimental Astronomy, v. 13, Issue 2, p. 59-76 (2002).
Astronomy and Astrophysics
Astronomy
29
Échelle Spectrograph Design, High Resolution Spectroscopy, É, Chelle Spectrograph Design
Scientific paper
The High Efficiency and Resolution Canterbury University Large Échelle Spectrograph (HERCULES) a fibre-fed échelle spectrograph that was designed and built at the University of Canterbury and has been in operation at Mt. John University Observatory since April 2001.HERCULES receives light from the f/13.5 Cassegrain focus of the 1 m McLellan telescope. Resolving powers of R = 41 000, 70 000 and 82 000 are available. An R2 200 × 400 mm échelle grating provides dispersion and cross-dispersion uses a large BK7 prism in double pass. The wavelength coverage is designed to be 380-880 nm in a single exposure. The maximum detective quantum efficiency of the fibre, spectrograph and detector system is about 18% in 2 arc second seeing. High wavelength stability (to better than 10 ms-1 in radial velocity) is achieved by installing the whole instrument in a large vacuum tank at 2-4 torr and by there being no moving parts. The tank is in a thermally isolated and insulated environment. The paper describes the design philosophy of HERCULES and its performance during the first year of operation.
Barnes Stuart I.
Frost Nicholas
Graham Garrett
Hearnshaw John B.
Kershaw G. M.
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