Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-03-28
Astronomy and Astrophysics
Astrophysics
5 pages LaTeX with 5 eps figures (included). To appear in Astronomy and Astrophysics, Supp. Require LaTeX style l-aa (from A&A
Scientific paper
10.1051/aas:1997207
We present a near-infrared cooled grating spectrometer that has been developed at the Arcetri Astrophysical Observatory for the 1.5 m Infrared Telescope at Gornergrat (TIRGO). The spectrometer is equipped with cooled reflective optics and a grating in Littrow configuration. The detector is an engineering grade Rockwell NICMOS3 array (256x256 pixels of 40 $\mu$m). The scale on the focal plane is 1.73 arcsec/pixel and the field of view along the slit is 70 arcsec. The accessible spectral range is 0.95-2.5 $\mu$m with a dispersion, at first order, of about 11.5 angstroms/pixel. This paper presents a complete description of the instrument, including its optics and cryo-mechanical system, along with astronomical results from test observations, started in 1994. Since January 1996, LonGSp is offered to TIRGO users and employed in several Galactic and extragalactic programs.
Baffa Carlo
Biliotti Valdemaro
Gennari Sandro
Giani Elisabetta
Hunt Leslie
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