Internal calibration of astronomical photographs

Details Internal calibration of astronomical photographs Internal calibration of astronomical photographs

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983esasp.201..195b&link_type=abstract

In ESA Statist. Methods in Astron. p 195-200 (SEE N84-19196 09-89)

Astronomy and Astrophysics

Astronomy

53

Astronomical Photography, Calibrating, Stellar Magnitude, Stellar Spectrophotometry, Extrapolation, Image Processing, Photographic Measurement, Photographic Plates

Scientific paper

A method for deriving a photographic magnitude index for stellar images that is linearly related to photoelectric magnitude is discussed. The areal profile of a star is assumed to be independent of magnitude, and is used to define a mapping function for placing isophotal magnitudes on the linear magnitude scale. This internally derived scale is reliably linear over the complete magnitude range of stellar images found on a photographic plate and therefore provides a simple means for extrapolating photoelectric sequences to faint magnitudes. The emulsion response and seeing profile of the atmosphere/plate/measuring system combination are also obtained.

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