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The Calibration of Deep Photographic Photometry

Published online by Cambridge University Press:  25 April 2016

Warrick J. Couch  and
E. B. Newell
Warrick J. Couch
Affiliation:
Mount Stromlo and Siding Spring Observatories, Australian National University
E. B. Newell
Affiliation:
Mount Stromlo and Siding Spring Observatories, Australian National University
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Extract

Observational tasks that require photometry of large numbers of objects, or over large fields, are still best approached using photographic photometry. Nevertheless, there are well-known problems in using photographic emulsions as two-dimensional detectors; these include their non-linearity and unknown photometric zero-points. The non-linearity can be calibrated using standard sensitometer techniques but the provision of photometric zero-points (and the verification of the validity of the intensity calibration) can be done properly only by providing a sequence of standards down to the plate limit. One approach to this latter problem, that has recently been revived by Racine (1969), is to use a sub-beam prism as originally suggested by Pickering (1891).

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 4 , Issue 1 , 1980 , pp. 85 - 88
Copyright
Copyright © Astronomical Society of Australia 1980

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References

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