SARG: The High Resolution Spectrograph of TNG |
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| Authors: | R G Gratton G Bonanno P Bruno A CalÍ R U Claudi R Cosentino S Desidera F Diego G Farisato G Martorana M Rebeschini S Scuderi |
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| Institution: | (1) Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio, 5, I-35122 Padova, Italy;(2) Osservatorio Astrofisico, via S. Sofia, 78, I-95123 Catania, Italy;(3) Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio, 5, I-35122 Padova, Italy;(4) Centro Galileo Galilei, CNAA, Calle Alvarez de Abreu, 70, 1st Floor, 38700 Santa Cruz de La Palma, TF, Spain;(5) Department of Physics and Astronomy, University College of London, Gower Street, London, WCLE 6BT, U.K. |
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| Abstract: | SARG is a cross dispersed echelle spectrograph in operation since late spring 2000 at the Italian Telescopio Nazionale Galileo
(TNG) 3.5 m telescope, La Palma. SARG offers both single object and long slit (up to 26 arcsec) observing modes covering a
spectral range from λ = 0.37 up to1 μm, with resolution ranging from R = 29,000 up to R = 164,000. Cross dispersion is provided by means of a selection of four grisms; interference filters may be used for the
long slit mode (up to 26 arcsec). A dioptric camera images the cross dispersed spectra onto a mosaic of two 2048 × 4096 EEV
CCDs (pixel size: 13.5 μm) allowing complete spectral coverage at all resolving power for λ < 0.8 μm. In order to reach a
high wavelength calibration precision an iodine-absorbing cell is provided. A Distributed Active Temperature Control System
(DATCS) maintains constant the temperature of all spectrograph components at a preset value. Early results show that SARG
works according to original specifications in terms of wavelength coverage, efficiency (measured peak efficiency is about
13%),resolution (maximum resolution R = 164,000 using a 0.3 arcsec slit, R ∼144,000 using an image slicer), and stability (preliminary estimates of radial velocity accuracy is ∼3 m/s using the iodine
cell and ±150 m/s without the iodine cell).
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | instrumentation spectrographs |
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