Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..526b&link_type=abstract
Astronomy and Astrophysics, Vol. 235, NO. AUG(II), P. 526, 1990
Astronomy and Astrophysics
Astrophysics
3
Instruments, Spectroscopy, Image Processing, Data Analysis, Pattern Recognition
Scientific paper
The development of a computerized reduction technique applicable to moderate spectral resolution, long slit spectrography is presented. Any frame composed of a central spectrum surrounded by two comparison spectra can be processed.
Algorithms to correct for the various distortions and to set a reliable wavelength calibration are described. Assumptions on the mathematical shape of distortions, in connection with their origin, are made unnecessary by the use of a new automatic detection algorithm providing a self-determination of the model correction. The wavelength calibration procedure computes the dispersion for each row and corrects for the slit curvature.
The resulting programmes are chained in an interactive or automatic procedure run on a VAX 780 computer in the context of the ESO/MIDAS environment, but the modular programming allows easy adaptations to other systems.
Bruynooghe Maurice
Burgarella Denis
Llebaria Antoine
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