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Cassegrain echelle spectroscopy with small telescopes

Published online by Cambridge University Press:  04 August 2017

J. B. Hearnshaw
J. B. Hearnshaw*
Affiliation:
Mt John University Observatory, Department of Physics, University of Canterbury Christchurch, New Zealand

Abstract

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This paper comments on the growing use of cassegrain échelle spectrographs for high resolving power astronomical spectroscopy over the last two decades. Some of the theoretical and practical advantages of échelle spectrographs are outlined, as well as some of the problems that arise in their use. Design parameters of some recent échelle spectrographs in various observatories are summarised. A novel use of échelle spectrographs without a cross-dispersing element for radial velocity spectrometry is proposed. The design parameters of a fibre-fed échelle spectrograph that will achieve a resolving power of about 7 × 104 with a 2 arc second input from a 1m telescope are outlined.

Type
III. Spectroscopic Research Programmes
Information
Symposium - International Astronomical Union , Volume 118: Instrumentation and Research Programmes for Small Telescopes , 1986 , pp. 371 - 384
Copyright
Copyright © Reidel 1986 

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