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7 March 2003 HERCULES: a high-resolution spectrograph for small to medium-sized telescopes
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The High Efficiency and Resolution Canterbury University Large Echelle Spectrograph (HERCULES) is a fibre-fed echelle spectrograph that has been in operation at the Mount John University Observatory for just over one year. HERCULES is used in conjunction with the 1-m McLellan telescope, and can capture the spectrum from 380 nm to 880 nm on a single 50-mm square CCD. Resolving powers of up to 70000 are possible when using 50-μm fibres, and a resolving power of 35000 is possible with a 100-μm fibre. Wavelength calibration is done using sequential exposures of a thorium-argon emission lamp. The spectrograph is designed to achieve high efficiency when the seeing is well matched to the image scale on the fibre input (up to 20% in 1 arcsec seeing), and high stability is achieved by having the spectrograph installed inside a vacuum tank in a thermally isolated environment. Initial indications are that radial velocities with a precision of ≤ 10 ms-1 are routinely possible in the short-term.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stuart I. Barnes, John B. Hearnshaw, Graeme Kershaw, Nigel Frost, R. Ritchie, G. Graham, and Garry Nankivell "HERCULES: a high-resolution spectrograph for small to medium-sized telescopes", Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003);


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