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A&A Supplement Ser., Vol. 124, September 1997, 573-577

Received November 8; accepted December 2, 1996

LonGSp: The Gornergrat longslit infrared spectrometer

L. Vanzitex2html_wrap804, M. Sozzitex2html_wrap806, G. Marcuccitex2html_wrap804, A. Marconitex2html_wrap804, F. Mannuccitex2html_wrap806, F. Lisitex2html_wrap814, L. Hunttex2html_wrap806, E. Gianitex2html_wrap804, S. Gennaritex2html_wrap814, V. Biliottitex2html_wrap814, and C. Baffatex2html_wrap814

Send offprint request: L. Vanzi

tex2html_wrap826  Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 5, I-50125 Firenze, Italy
tex2html_wrap828  Centro per l'Astronomia Infrarossa e lo Studio del Mezzo Interstellare-CNR, Largo E. Fermi 5, I-50125 Firenze, Italy
tex2html_wrap830  Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy


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 (tex2html_wrap_inline788 pixels of tex2html_wrap_inline790). 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 tex2html_wrap_inline792 with a dispersion, at first order, of about 11.5 Å/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.

keywords: instrumentation: spectrometers -- infrared: general

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