The Instrument

LIRIS is a near-infrared imager and spectrograph built by the Instituto de Astrofísica de Canarias [1]. It is operated as a common user instrument (see Fig. 1) on the 4.2 m William Herschel Telescope at the Observatorio del Roque de Los Muchachos (ORM-La Palma) since August 2004. The detector is a HAWAII-I array operating at 70 K. Currently, LIRIS includes imaging and spectroscopic observing modes. Spectroscopy is performed with long-slit and a number (~8) of multi-object masks. Grisms are used as dispersion elements providing a resolution of 650. In the future it will also include R~3000.

Figure 1. LIRIS attached to the Cassegrain platform at the 4.2 m William Herschel Telescope.

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