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Analytical Approximations of Long-Exposure Point Spread Functions and their Use

Published online by Cambridge University Press:  14 August 2015

O. Bendinelli ,
G. Parmeggiani  and
F. Zavatti
O. Bendinelli
Affiliation:
Dipartimento di Astronomia, Universita’ di Bologna
G. Parmeggiani
Affiliation:
Osservatorio Astronomico di Bologna
F. Zavatti
Affiliation:
Dipartimento di Astronomia, Universita’ di Bologna

Abstract

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The observed light distribution in long exposure star images (PSF) may be fitted equally well by a variety of models. But dealing with undersainpled star images, only the use of the multi-Gaussian model allows the correct model parameters estimation, taking into account integration on pixel surface, image off-centering and background behaviour. It is also shown that the convolution of a spherical source with the multi-Gaussian and Moffat’s models gives in practice the same result.

Type
Joint Commission Meeting
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 657 - 661
Copyright
Copyright © Kluwer 1989

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