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. Ragazzoni, E. Marchetti, - G. Brusa

Send offprint request: R. Ragazzoni

  Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
e-mail: ragazzoni@astrpd.pd.astro.it
  CISAS, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
e-mail: marchetti@astrpd.pd.astro.it
  Center for Astronomical Adaptive Optics, 933 N Cherry Ave. Tucson, U.S.A.
e-mail: gbrusa@as.arizona.edu

Abstract:

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 distribution. Two case studies for D=3.58 and D=8.00 meter telescopes are given.

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

 
• 1. Introduction
• 2. The single layer case
• 3. The multi-layer case
• 4. Applications to atmosphere models
• 5. Conclusions
• References