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Proceedings Paper

Anisoplanicity studies within NGC6871
Author(s): Jason A. Marshall; Mitchell Troy; Richard G. Dekany; Frank G. Dekens
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Paper Abstract

Images corrected with adaptive optics benefit from an increase in the amount of flux contained within the diffraction-limited core. The degree of this correction is measured by the Strehl ratio, equal to the ratio of the maximum observed intensity to the maximum theoretical intensity. Natural guide star adaptive optics systems are limited by the need for a guide star of adequate magnitude within suitable proximity to the science target. Thus, the above-described benefit can only be obtained for objects over a fraction of the total sky. Two nights of imaging the central region of the open star cluster NGC6871 with the Palomar Adaptive Optics System has supplied measurements of the Strehl ratio for numerous stars within the field. These measurements were used to calculate K band isoplanatic angles of 39 arcseconds (UT 1999 May 31) and 50 arcseconds (UT 1999 August 1). These isoplanatic angles are compared to those derived from Kolmogorov atmospheric theory, and their implications for adaptive optics systems are discussed.

Paper Details

Date Published: 7 July 2000
PDF: 8 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390376
Show Author Affiliations
Jason A. Marshall, Univ. of California/Los Angeles (United States)
Mitchell Troy, Jet Propulsion Lab. (United States)
Richard G. Dekany, Jet Propulsion Lab. (United States)
Frank G. Dekens, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

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