Statistics – Applications
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..253s&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, Apr.-May 1981, p. 253-263.
Statistics
Applications
21
Astronomical Photography, Image Processing, Photometers, Calibrating, Photographic Plates, Stellar Magnitude
Scientific paper
A general method is presented for solving problems encountered in the analysis of Iris diaphragm photometer (IDP) data. The method is used to derive the general shape of the calibration curve, allowing both a more accurate fit to the IDP data for comparison stars and extrapolation to magnitude ranges for which no comparison stars are measured. The profile of starlight incident and the characteristic curve of the plate are both assumed and then used to derive the profile of the star image. An IDP reading is then determined for each star image. A procedure for correcting the effects of a nonconstant background fog level on the plate is also demonstrated. Additional applications of the method are made in the appendix to determine the relation between the radius of a photographic star image and the star's magnitude, and to predict the IDP reading of the 'point of optimum density'.
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