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Proceedings Paper

HERCULES: a high-resolution spectrograph for small- to medium-sized telescopes
Author(s): Stuart I. Barnes; John B. Hearnshaw; Graeme Kershaw; Nigel Frost; R. Ritchie; G. Graham; Garry Nankivell
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Paper Abstract

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.

Paper Details

Date Published: 7 March 2003
PDF: 6 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.460898
Show Author Affiliations
Stuart I. Barnes, Univ. of Canterbury (New Zealand)
John B. Hearnshaw, Univ. of Canterbury (New Zealand)
Graeme Kershaw, Univ. of Canterbury (New Zealand)
Nigel Frost, Univ. of Canterbury (New Zealand)
R. Ritchie, Univ. of Canterbury (New Zealand)
G. Graham, Univ. of Canterbury (New Zealand)
Garry Nankivell, Univ. of Canterbury (New Zealand)

Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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