FIDEOS: a high resolution echelle spectrograph for the ESO 1m telescope at La Silla

摘要

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° blaze angle echelle grating in quasi-Littrow mode, providing spectral resolution of R～42 000, covering the spectral range from 400nm to 680 nm. The detector is a 2k×2k CCD with 15 μm pixels. The spectrograph will be fed by two 50 μm 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.