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Proceedings Paper

Spectroscopy with adaptive optics: example and quality of GraF data
Author(s): Almas Chalabaev; Etienne Le Coarer; David Le Mignant; Patrick Rabou; Panayoti Petmezakis; Y. Mignart
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Paper Abstract

We discuss the quality of the spectro-imaging data (integral field spectroscopy) of the GraF instrument used with the ADONIS adaptive optics system at the ESO 3.6 m telescope in 1997-2001. The integral filed spectroscopy was obtained using a Fabry-Perot interferometer (FPI) in cross-dispersion with a grating spectrograph. A cube of spectro-imaging data at λ ≈ 2200 nm covers a 1.5" x 12.4" sky field sampled with 0.05" pixels; the field is recorded at 384 spectral points with the spectral resolution R ≈ 7000. The maximum field and spectral resolution are wavelength dependent, e.g. λ ≈ 1650 nm the field is 0.9" x 9" sampled with 0.035", recorded at 432 spectral points with R ≈ 10000. A spectrum of a B3III standard in the hydrogen Br-γ 2165.5 nm line and spectro-imaging of the complex central region of the eruptive star η Car in the spectral range 1668-1692 nm, including Br-11 1680.6 nm, [FeII] 1676.9 nm, FeII 1678.7 nm and FeII 1687.3 nm lines, are presented along with the discussion concentrated on the accurate calibration of the spatial point-spread function for the image deconvolution, the photometric monitoring of the FPI spectral scan channels, and on the final quality of the extracted spectra.

Paper Details

Date Published: 7 March 2003
PDF: 8 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.459871
Show Author Affiliations
Almas Chalabaev, Lab. d'Astrophysiqe de l'Observatoire de Grenoble (France)
Etienne Le Coarer, Lab. d'Astrophysiqe de l'Observatoire de Grenoble (France)
David Le Mignant, W. M. Keck Observatory (United States)
Patrick Rabou, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Panayoti Petmezakis, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Y. Mignart, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)


Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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