CCD star images: On the determination of Moffat’s PSF shape parameters

The problem of obtaining simultaneous estimates of Moffat's (1969) point spread function (PSF) shape parameters, the off-centering parameter, and the background level in CCD star images is considered. An approximate means of determining all the parameters except off-centering is presented. It i...

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Bibliographic Details
Published in:Journal of astrophysics and astronomy 1988-03, Vol.9 (1), p.17-24
Main Authors: Bendinelli, O., Parmeggiani, G., Zavatti, F.
Format: Article
Language:English
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Summary:The problem of obtaining simultaneous estimates of Moffat's (1969) point spread function (PSF) shape parameters, the off-centering parameter, and the background level in CCD star images is considered. An approximate means of determining all the parameters except off-centering is presented. It is noted that Moffat's PSF model is a softened power law belonging to the family of modified King (1971) and Hubble models. An integral equation making it possible to convolve a spherical source with Moffat's PSF has been obtained and is applied to a multi-Gaussian convolution. (R.R.)
ISSN:0250-6335
0973-7758
DOI:10.1007/BF02715053