Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..669m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 669-676. Research supported by Institut National d'A
Astronomy and Astrophysics
Astrophysics
94
Imaging Spectrometers, Solar Spectrometers, Spectral Resolution, Spectroscopic Telescopes, Computer Programs, Image Processing, Image Resolution, Imaging Techniques, Line Spectra
Scientific paper
The present study describes a new instrument that uses the multichannel subtractive double pass (MSDP) technique. Its main capabilities are: simultaneous spectro-imaging in two line profiles (medium and strong lines), high spatial resolution in all the 2D fields, no differential seeing effects at all wavelengths, best compromises between exposure time and spectral resolution for lines, fast change of wavelength, and the possibility of spectro-imaging with high spectral resolution by successive exposures (weak lines). Either 9 or 11 channels are recorded simultaneously in each line profile. The field size is typically 120 x 1000 or 60 x 1000 diffraction widths of the telescope image. The spectral resolving power is 100,000 in one exposure. The optical design and the codes for data processing are reviewed. The performances of the MSDP and the other 2D spectroscopy techniques are briefly compared and possible improvements with regard to the spectral resolution are discussed.
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