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The Cassegrain Echelle Spectrograph at Mt John Observatory

Published online by Cambridge University Press:  25 April 2016

J. B. Heamshaw
J. B. Heamshaw*
Affiliation:
Department of Physics, University of Canterbury
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Extract

The standard formula for the resolving power R(= λ/Δλ) of an astronomical grating spectrograph is Here L is the linear size of the grating, perpendicular to the direction of the grooves, θB is the blaze angle of the grating, θS is the angular size of the slit, projected back on to the sky, and D is the diameter of the telescope objective. The formula is valid for gratings used in the Littrow condition, when the angle of incidence α, and the angle of diffraction β, are both close to θB.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 3 , Issue 2 , September 1977 , pp. 102 - 103
Copyright
Copyright © Astronomical Society of Australia 1977

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