Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..111..359l&link_type=abstract
Astronomy and Astrophysics Supplement, v.111, p.359
Astronomy and Astrophysics
Astrophysics
9
Techniques: Spectroscopy, Interferometry, Globular Clusters: General, Techniques: Miscellaneous
Scientific paper
To achieve true 3D imaging spectroscopy in a wide spectral bandwidth with a high spectral resolution, we propose a new way of using the Fabry-Perot (FP) interferometer. As in a cross dispersion technique, we simultaneously observe all the interference orders which are separated by a grating. We have at the same time the m elements of a Fabry Perot's channelled spectrum. After the scan of only one free spectral range of the FP, with a finesse F, we obtain the data of M=mF spectral elements. In order to achieve high spatial resolution imaging, we sample the field of view with a bidimensional micro-lens array, located at the entrance of this spectrometer . The optical design uses a field/pupil inversion, so that spectral and spatial information become independent. The high spectral resolution of the FP interferometer (λ/{DELTA}λ=4x10^4^) in the wide bandwidth of the grating ({DELTA}λ=100nm) is well adapted to study absorption lines. For example across a globular cluster we have estimated a limited magnitude of 17 at a signal to noise ratio of 10 using a four hour integration sequence with a 3.60m telescope.
Bensammar Slimane
Comte Georges
Gach Jean-Luc
Georgelin Yvon
Le Coarer Etienne
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