Abstract

FIDEOS (FIbre Dual Echelle Optical Spectrograph) is a fibre-fed bench-mounted high-resolution echelle spectrograph for the 1-m telescope at ESO in La Silla, Chile. It is based on a 44.41 lines/mm 70 degrees blaze angle echelle grating in quasi-Littrow mode, providing spectral resolution of R similar to 42000, covering the spectral range from 400nm to 680nm. The detector is a 2k x 2k CCD with 15 mu m pixels. The spectrograph will be fed by two 50 mu m core diameter fibres for the astronomical object and the simultaneous calibration lamp, respectively. Alternatively, an iodine cell will be mounted on the telescope-spectrograph interface, providing a secondary spectral calibration source. In addition, the instrument will be mounted on a fixed optical-bench without movable parts rather than the CCD shutter and its enclosure will be thermally controlled to ensure opto-mechanical stability. Since the FIDEOS will deliver high resolution and spectral stability, it will be optimized for precision radial velocities.