An improved International Ultraviolet Explorer (IUE) image processing system. The case of absorption lines in high dispersion spectra

Physics

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Error Correcting Devices, Image Processing, Iue, Ultraviolet Spectra, Absorption Spectra, Cosmic Rays, Gauss Equation, Instrument Errors, Least Squares Method, Stellar Spectra

Scientific paper

A correction procedure was developed for the problem of overestimated background correction where the echelle orders crowd together and for cosmic ray-induced spots which contribute to the observed intensity or to the background. The raw data matrix was rotated 45 deg to have the interference orders mostly parallel to the columns of the matrix. A step by step determination was then made of both background profile and intensity profile across the orders. The method was applied to a 7 1/2 hour exposure spectrum of the SMC star S-159. An improvement in background correction was noted, as well as a net gain in spectral resolution.

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