Astron. Astrophys. Suppl. Ser.
Volume 124, Number 3, September 1997
|Page(s)||573 - 577|
|Published online||15 September 1997|
LonGSp: The Gornergrat longslit infrared spectrometer
Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 5, I–50125 Firenze, Italy
2 Centro per l'Astronomia Infrarossa e lo Studio del Mezzo Interstellare–CNR, Largo E. Fermi 5, I–50125 Firenze, Italy
3 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I–50125 Firenze, Italy
Send offprint request to: L. Vanzi
Accepted: 2 December 1996
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 ( pixels of ). 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 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.
Key words: instrumentation: spectrometers / infrared: general
© European Southern Observatory (ESO), 1997