Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97.1215c&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Dec. 1985, p. 1215-1226.
Astronomy and Astrophysics
Astronomy
13
Astronomical Observatories, Astronomical Photography, Atmospheric Effects, Fluctuation Theory, Image Analysis, Telescopes, Binary Stars, Camera Shutters, Correlation, Hawaii, High Resolution
Scientific paper
Trailed images of optical pairs of stars obtained with the Canada-France-Hawaii 3.6-m telescope on Mauna Kea were analyzed to study seeing fluctuations. The data show that seeing fluctuations, evaluated from the 'macroscopic' properties of a guide star image, i.e., image centroid and image width, are correlated for separations as large as 1 arc min. Seeing fluctuations as frequencies less than 5 Hz were correlated for most image pairs in this particular data set. Higher frequency variations were correlated only for pairs with separations less than 8 arc sec. In a simulation of very high resolution imagery using an offset guide star, the quality of detected program images were improved by as much as 70 percent. Guide decision times ranged from 10 to 50 msec, depending on the observational circumstances.
Christian Carol
Racine Rene
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