Journal Article

Laser Guide Star for 3.6- and 8-m telescopes: Performance and astrophysical implications

M. Le Louarn, R. Foy, N. Hubin and M. Tallon

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 295, issue 4, pages 756-768
Published in print April 1998 | ISSN: 0035-8711
Published online April 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01223.x
Laser Guide Star for 3.6- and 8-m telescopes: Performance and astrophysical implications

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Abstract

We have constructed an analytical model to simulate the behaviour of an adaptive optics system coupled with a sodium laser guide star. The code is applied to 3.6- and 8-m class telescopes. The results are given in terms of Strehl ratio and full width at half-maximum of the point spread function. Two atmospheric models are used, one representing good atmospheric conditions (20 per cent of the time), the other median conditions.

Sky coverage is computed for natural guide star and laser guide star systems, with two different methods. The first one is a statistical approach, using stellar densities to compute the probability of finding a nearby reference. The second is a cross-correlation of a science-object catalogue and the USNO catalogue. Results are given in terms of percentage of the sky that can be accessed with given performances, and in terms of the number of science objects that can be observed, with Strehls greater than 0.2 and 0.1 in the K and J bands.

Keywords: atmospheric effects; telescopes

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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