Physics – Optics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..570m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, June 1991, p. 570-576. Research supported by NSERC
Physics
Optics
20
Astronomical Photography, Atmospheric Attenuation, Atmospheric Turbulence, Optical Measuring Instruments, Point Spread Functions, Anisotropy, Charge Coupled Devices, Image Enhancement, Wave Fronts
Scientific paper
A long-exposure CCD frame has been obtained with image quality of 0.26-0.34 arcsec (FWHM) using the DAO/CFHT image-stabilizing camera at the prime focus of the Canada-France-Hawaii Telescope. The entrance aperture was stopped down to 1.2 m and, at this aperture size, the effect of imperfect isoplanatism is seen by comparing images of stars of varying distances from the guide star. The deterioration of the image quality is seen to occur faster along the direction toward the guide star, thus elongating the images, as expected from theoretical considerations. A centrally peaked 'Bismark' profile is found to be best fit the shape of the stabilized point-spread function. It is pointed out that new image-analysis tools will be required to fully exploit astronomical data obtained with adaptive optics systems.
Arnaud Jean
Fletcher Murray J.
McClure Robert D.
Nieto Jean-Luc
Racine Rene
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