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Proceedings Paper

The influence of spot saturation on DIMM seeing measurements
Author(s): Antonia Maria Varela; Casiana Munoz-Tunon; Jean Vernin
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Paper Abstract

The DIMM is a widely accepted and often used instrument for seeing measurements. Nevertheless, its incorrect use may give rise to errors in seeing values. A detailed analysis of the parameters involved in the seeing calculation is being undertaken and the effect of saturation of the spots in particular is analyzed in this contribution. Our results reveal that the saturation increases not only the photon noise but also the speckles, which will acquire a greater relative weight with respect to the stellar spot. The result is an increase in the variance of the centroids, which results in artifically higher seeing values.

Paper Details

Date Published: 7 July 2004
PDF: 5 pages
Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); doi: 10.1117/12.566376
Show Author Affiliations
Antonia Maria Varela, Instituto de Astrofisica de Canarias (Spain)
Casiana Munoz-Tunon, Instituto de Astrofisica de Canarias (Spain)
Jean Vernin, Univ. de Nice-Sophia Antipolis (France)

Published in SPIE Proceedings Vol. 5382:
Second Backaskog Workshop on Extremely Large Telescopes
Arne L. Ardeberg; Torben Andersen, Editor(s)

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