Photograph of COLORES installed on the Cassegrain focus of the 60 cm TELMA telescope at BOOTES-2 observatory in southern Spain.
Photograph and detailed layout of COLORES. The main parts are (a) entry of the instrument, (b) wavelength calibrations system, (c) slit wheel, (d) refractive collimator, (e) grism (and polarizer) wheel, (f) filter wheel, (g) refractive camera, (h) CCD camera, and (i) the electronic control system.
The optical layout and configuration of COLORES in both its main observing modes.
Encircled energy for each image within the FOV. The telescope contribution is included.
The spot diagrams of the COLORES instrument, including the telescope contribution. Each box represents 3 × 3 pixels. Nine wavelengths (shown in top right, units are μm).
Mechanical envelope of COLORES, previous to anodizing. The structure material is built of aluminium and lightweight carbon fibre. Aluminium plates were perforated to reduce weight.
(a) Photograph of the grism location installed in the grism wheel and (b) its actual size in the mechanical envelope.
Overall transmission of COLORES (including the telescope) in grey color and the transmission for each Sloan g′ r′ i′ and Johnson-Cousins photometric R-band, as well as for the WIFICAM Z- and Y-band filters.
Image of the COLORES full slit (2.1 arc sec) fluorescence lamp exposure on the CCD.
Argon (Hg) and Krypton lamps spectra. The location of these spectral lines in the detector allows us to calculate the relationship between the pixel position and wavelength by a n-order polynomial.
Calibration of wavelength from peak location for wavelengths between 400 nm and 900 nm. The solid line is a third-order polynomial fit, λ(nm) = c 3 x 3 + c 2 x 2 + c 1 x + c 0, where x is the pixel number and c 3 = 1.13436 × 10−8, c 2 = −1.18750 × 10−5, c 1 = 0.67376, c 0 = 405.41.
Comparison of the measured and predicted spectral dispersion of COLORES with Grism 1.
Using Vega for both photometric and spectral calibration. Note the second-order contamination around 500–600 nm.
Images of (a) unfiltered M 51 and (b) M 57 with g′ r′ i′ filters.
Top level technical requirements.
Optical characteristics of TELMA + COLORES spectrograph.
Grisms available on COLORES and their characteristics.
Spectral resolutions for each combination of Grisms and slits.
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