An echelle spectrograph

Details An echelle spectrograph An echelle spectrograph

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978s%26t....56....6h&link_type=abstract

Sky and Telescope, vol. 56, July 1978, p. 6-8.

Astronomy and Astrophysics

Astronomy

13

Astronomical Spectroscopy, Echelle Gratings, Spectrographs, Stellar Spectra, Astronomical Photography, New Zealand, Radial Velocity, Reflecting Telescopes

Scientific paper

It is pointed out that the use of echelle spectrographs during the last decade marks a turning point in high-resolution stellar spectrography at optical wavelengths. In the case of an echelle spectrograph, use is made of a blazed grating with relatively few rulings that sends most of the light into a number of high-order spectra. Echelle gratings give a higher dispersion of starlight, and the different wavelengths are separated more effectively. A description is presented of a spectrograph which was built in New Zealand during 1975-76. The instrument is attached to a 24-inch reflector at Mount John Observatory on South Island of New Zealand. The spectrum of Canopus which was obtained during evaluation tests of the Cassegrain echelle spectrograph is also discussed.

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