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Proceedings Paper

Design study of an adaptive optics visual echelle spectrograph and imager for the VLT
Author(s): Roberto Pallavicini; Luca Pasquini; Bernard Delabre; Norbert N. Hubin; Paolo Conconi; Luciano Mantegazza; Ruben Mazzoleni; Emilio Molinari; Filippo Maria Zerbi; Paolo P. Molaro; P. Bonifacio; Paolo Santin; P. Dimarcantonio; Mariagrazia Franchini; Giovanni Bonanno; Pietro Bruno; Rosario Cosentino; Salvatore Scuderi; Santo Catalano; Marcello Rodono; Pasquale Caldara; Francesco Damiani; Maurizio Comari; S. Monai; F. Passaretta
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Paper Abstract

We present a preliminary design study for an adaptive optics visual echelle spectrograph and imager/coronograph for use as parallel instrument of the Nasmyth Adaptive Optics System (NAOS) on unit UT3 of the VLT. The spectrograph is intended for intermediate resolution spectroscopy of faint sources. It could be used for observations of late-type dwarfs in distant Galactic clusters and in galaxies of the local group as well as for spectroscopy of extra galactic objects like quasars and Lyman break galaxies down to a limiting magnitude of V equals 22.5. The implementation of an imaging gand coronograph mode increases the versatility of the instrument and its scientific objectives. The instrument takes advantage of Adaptive Optics at visible wavelengths both for imaging and spectroscopy. With NAOS at the VLT, the light concentration in these bands will be above approximately 60 percent of the flux in a 0.3 arcsec aperture for typical Paranal conditions. Simulations show that a gain of more than one magnitude with respect to compatible non-adaptive optical spectrography will be possible for sky- and/or detector limited observations. In addition, the smaller diffraction limit in the optical than in the IR will allow a significant gain in imaging and coronography as well. Finally, the instrument will allow gathering unprecedented experience on the performances of AO at visible wavelengths, which will be fundamental for further development of AO systems, in particular for very large telescopes.

Paper Details

Date Published: 16 August 2000
PDF: 8 pages
Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); doi: 10.1117/12.395463
Show Author Affiliations
Roberto Pallavicini, Osservatorio Astronomico di Palermo (Italy)
Luca Pasquini, European Southern Observatory (Germany)
Bernard Delabre, European Southern Observatory (Germany)
Norbert N. Hubin, European Southern Observatory (Germany)
Paolo Conconi, Osservatorio Astronomico di Brera (Italy)
Luciano Mantegazza, Osservatorio Astronomico di Brera (Italy)
Ruben Mazzoleni, Osservatorio Astronomico di Brera (Italy)
Emilio Molinari, Osservatorio Astronomico di Brera (Italy)
Filippo Maria Zerbi, Osservatorio Astronomico di Brera (Italy)
Paolo P. Molaro, Osservatorio Astronomico di Trieste (Italy)
P. Bonifacio, Osservatorio Astronomico di Trieste (Italy)
Paolo Santin, Osservatorio Astronomico di Trieste (Italy)
P. Dimarcantonio, Osservatorio Astronomico di Trieste (Italy)
Mariagrazia Franchini, Osservatorio Astronomico di Trieste (Italy)
Giovanni Bonanno, Osservatorio Astrofisico di Catania (Italy)
Pietro Bruno, Osservatorio Astrofisico di Catania (Italy)
Rosario Cosentino, Osservatorio Astrofisico di Catania (Italy)
Salvatore Scuderi, Osservatorio Astrofisico di Catania (Italy)
Santo Catalano, Osservatorio Astrofisico di Catania (Italy)
Marcello Rodono, Osservatorio Astrofisico di Catania (Italy)
Pasquale Caldara, Osservatorio Astronomico di Palermo (Italy)
Francesco Damiani, Osservatorio Astronomico di Palermo (Italy)
Maurizio Comari, Osservatorio Astronomico di Trieste (Italy)
S. Monai, Osservatorio Astronomico di Trieste (Italy)
F. Passaretta, Osservatorio Astronomico di Brera (Italy)

Published in SPIE Proceedings Vol. 4008:
Optical and IR Telescope Instrumentation and Detectors
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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