Correcting for nonuniform background in IRIS diaphragm photometry

Details Correcting for nonuniform background in IRIS diaphragm photometry Correcting for nonuniform background in IRIS diaphragm photometry

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..533s&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Aug.-Sept. 1979, p. 533-539.

Astronomy and Astrophysics

Astronomy

7

Astronomical Photography, Astronomical Photometry, Diaphragms (Mechanics), Imaging Techniques, Optical Correction Procedure, Calibrating, Correlation, Data Processing, Fog, Nonuniformity, Photographic Plates

Scientific paper

A method is developed to correct for nonuniform background fog levels in photographic photometry. This is done by modeling how an iris diaphragm photometer works, the shape of a star image, and the plate's response to background light. This easy method requires only an unmodified iris diaphragm photometer. Over a hundred plates have been measured using this procedure with good success. In addition, four plates with gross nonuniformity and a wide variety of conditions, are examined in detail. The method successfully corects the data to near what it would be if the plates had uniform background fog.

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