Stellar Photometry With An Electrographic Camera

A. V. Hewitt; H. D. Ables

doi:10.1117/12.959799

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21 November 1980 Stellar Photometry With An Electrographic Camera

A. V. Hewitt, H. D. Ables

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Proceedings Volume 0264, Applications of Digital Image Processing to Astronomy; (1980) https://doi.org/10.1117/12.959799
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

We have carried out photometry of stellar images from plates taken with a Kron electrographic camera and measured with a PDS 1010 microdensitometer. Attention has been given to significant sources of error in measurement and reduction of the stellar images and in photometric calibrations of the electrographic camera. These include: sky background noise crowding plate defects detector areal response color transformations linearity mjcrodensitometer errors. Each has been investigated in isolation in order to minimize its contribution to the photometric uncertainty of a stellar measure. As in conventional photoelectric photometry some sources of error are difficult to reduce below the one percent level. For well exposed stellar images the photometric uncertainty deduced from comparisons with photoelectric calibrations is less than 3 percent for a single measure. Although the techniques described were developed using electrographic camera plates measured on a PDS microdensitometer, the general principles are applicable to photometry with any type of panoramic detector.

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A. V. Hewitt and H. D. Ables "Stellar Photometry With An Electrographic Camera", Proc. SPIE 0264, Applications of Digital Image Processing to Astronomy, (21 November 1980); https://doi.org/10.1117/12.959799

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