The determination and calibration of photographic stellar image profiles

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photography, Photographic Plates, Stars, Calibrating, High Resolution, Mapping

Scientific paper

A method is described for exploiting mapping data to determine and calibrate stellar image profiles automatically, resulting in a so-called quasi-magnitude for each image which is linearly related to the normal magnitudes. The assumptions underlying the method are discussed, and a specific example based on a small sample of data produced by the old GALAXY machine is given. The basis of an algorithm for a simple numerical implementation of the method for arbitrary image profile functions is presented in an appendix.

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