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A&A Supplement series, Vol 121, March 1997, 569-573

Received April 1; accepted June 20, 1996

The effective layer height for star wandering and the accuracy of tilt sensing in multicolour laser stars

R. Ragazzonitex2html_wrap963, E. Marchettitex2html_wrap965, - G. Brusatex2html_wrap967

Send offprint request: R. Ragazzoni

tex2html_wrap969  Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
tex2html_wrap971  CISAS, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
tex2html_wrap973  Center for Astronomical Adaptive Optics, 933 N Cherry Ave. Tucson, U.S.A.


Due to the finite height of the mesospheric sodium laser guide star, it is shown that the measurement of absolute tilt done with the multi-colour laser star technique is affected by an uncertainty depending upon the tex2html_wrap_inline947 distribution. Two case studies for D=3.58 and D=8.00 meter telescopes are given.

keywords: atmospheric effects -- techniques: miscellaneous -- telescopes

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