Physics – Optics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2644c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Dec. 1985, p. 2644-2651.
Physics
Optics
18
Astronomical Photometry, Atmospheric Effects, Atmospheric Optics, Calibrating, Interferometry, Speckle Patterns, Histograms, Power Spectra, Spectrum Analysis, Transfer Functions
Scientific paper
In this paper the authors show the effect of different seeing conditions, as parametrized by the atmospheric coherence scale r0, upon standard Labeyrie (1970) analysis for independent observations of both a resolved object and its point-source calibrator. Atmosphere-dependent effects are shown by using both models and data. The authors show how to sort the data into like-seeing bins in order to produce a calibrated-image power-spectrum estimate. They also justify using a stonger weighting of intermediate spatial frequencies in the image power-spectrum estimator when fitting physical parameters constrained by image models to characterize the object. The use of data-editing techniques to eliminate bad speckle-grams, thus improving the image power-spectrum estimate, is also discussed.
Cheng Andrew Y. S.
Christou Julian C.
Hege Keith E.
Roddier Claude
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