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Some comments on the design of échelle spectrographs using R2 or R4 gratings for precise radial-velocity measurements

Published online by Cambridge University Press:  12 April 2016

John Hearnshaw ,
Norman Rumsey  and
Garry Nankivell
John Hearnshaw
Affiliation:
Dept. of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand
Norman Rumsey
Affiliation:
21 Malone Rd, Lower Hutt, NZ and Carter Observatory, Wellington, New Zealand
Garry Nankivell
Affiliation:
43 Holland St., Wainuiomata, Lower Hutt, NZ and Carter Observatory, Wellington, New Zealand

Abstract

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A new fiber-fed échelle spectrograph (Hercules) is being designed for the 1-m telescope at Mt John University Observatory. The goals are to have a wavelength capability of 380 to 880 nm, covered in a single exposure on a 50-mm square CCD, to have a choice of resolving powers of 35000 or 70000 and to have no moving parts. High precision radialvelocity observations are a major but not the only goal. Designs with both R2 (blaze angle 63.4 deg) and R4 (blaze angle 76 deg) échelle gratings are being considered, in either case with a dimension of 408 mm perpendicular to the grooves.

Type
Part 1. Instruments
Information
International Astronomical Union Colloquium , Volume 170: Precise Stellar Radial Velocities , 1999 , pp. 29 - 35
Copyright
Copyright © Astronomical Society of the Pacific 1999

References

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