Parasite light effects in International Ultraviolet Explorer (IUE) low resolution spectra

Computer Science

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Error Correcting Devices, Iue, Light Scattering, Ultraviolet Spectra, Curve Fitting, Gauss Equation, Gratings (Spectra), Image Processing, Instrument Errors, Lorentz Transformations, Stellar Spectra

Scientific paper

Procedures were developed for extracting low resolution spectra while correcting for halation effects and scattered light within the instrument. To correct for halation, the spectra were extracted from the line-by-line images. Perpendicular scans of the image were fitted using an iterative least squares procedure with a known form function. The fitting function was a linear combination of a Gaussian with a Lorentz function. Correction for light scattered from the gratings employed a guess and test method. A priori choices of schematic spectral distributions were used to compute different sets of scattered light coefficients. Satisfactory results are shown for both methods.

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