The Hercules Échelle Spectrograph at Mt. John |
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| Authors: | J B Hearnshaw S I Barnes G M Kershaw N Frost G Graham R Ritchie G R Nankivell |
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| Institution: | (1) Department of Physics and Astronomy and Mt. John University Observatory, University of Canterbury, Christchurch, New Zealand;(2) Lower Hutt, New Zealand |
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| Abstract: | 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.
Now deceased; formerly at
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | échelle spectrograph design high resolution spectroscopy |
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