Abstract

High–dispersion astronomical coudé spectrographs frequently give lower–precision radial velocities than expected. This is explained in part in terms of the variable spectral shifts along the plate produced by a camera mirror with zonal imperfections. For a mirror with a sinusoidal zonal irregularity, the standard deviation in the radial velocity depends inversely on the angular dispersion and size of the grating or prism and directly on the amplitude of the surface fluctuation. For a 300–mm grating with 1200 lines/mm used in first order at λ = 0.5 μm, a standard deviation of 0.06 km/sec is obtained for a single measurement if the surface has a peak–to–valley fluctuation of 1/20 wavelength of green light.

© 1969 Optical Society of America

A 4-m Asymmetric Czerny-Turner Grating Spectrograph

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Flat-Field Spectrograph Camera Designs

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Optimizing Czerny–Turner Spectrographs: A Comparison between Analytic Theory and Ray Tracing

Joseph Reader
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Anamorphic cameras for stellar spectrographs

J. M. Simon and M. C. Simon
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Photometric Error Analysis. VIII. the Temporal Power Spectrum of Scintillation

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