CASS ECHELLE DESCRIPTION
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Description:
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The Sandiford Cassegrain Echelle spectrograph is capable of R = 60,000
(5 km/s) resolution for two 27-micron pixels using a slit of one arcsecond.
The spectrograph operates over the wavelength range from 3,700 A to 11,000
A with high efficiency. Wavelength coverage is continuous (no gaps between
orders) for wavelengths less than 8,500 A. Cross dispersion is provided
by an LF5 prism in double pass; total spectral coverage in a single exposure
is 1,000 A to 1,500 A, depending on central wavelength, greatest in the
red and near infrared, and slit lengths up to 6 arcseconds are permitted.
The spectrograph operates very close to true Littrow, and matches the free
spectral range of a 23.2 gr/mm, R2 echelle grating to the long dimension
of a Reticon 1,200 X 400 CCD (RA2). A MicroLuminetics
CCD system provides remote guiding but not autoguiding.
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Contact person:
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David Doss 915/426-3676, <doss@astro.as.utexas.edu>
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Available telescope positions and information:
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2.1-m (f/13.5)
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Field scale = 7.4 arcsec/mm.
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Available CCD's:
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RA2