A&AS Supplement Series, Vol. 125, October II 1997, 367-380
Received October 9; accepted December 23, 1996
S. Robbe 
, B. Sorrente
, F. Cassaing,
Y. Rabbia, and G. Rousset
Send offprint request: S. Robbe (robbe@ocar01.obs-azur.fr)
Observatoire de la C\164te d'Azur,
Fresnel Department, UMR 6528,
Av. Copernic, 06130 Grasse, France
ONERA, 29 Av. de la Div
. Leclerc, BP. 72,
92322 Châtillon Cedex, France
The Active Stabilization in Stellar Interferometry (ASSI) recombining table, developed at
Office National d'Etudes et de Recherches Aérospatiales (ONERA), France, was implemented on the
two-Telescope Interferometer (I2T) of the Observatoire de la Côte d'Azur (OCA) in 1993, compensating
for the atmospheric turbulence wavefront fluctuations. Initial fringe observations were made in June
1994 with a 11 m North-South baseline. In this paper, we report the performance of the ASSI table
servo system for correction of the angle of arrival. Tracking accuracy of about 
arcsec was
achieved in typical seeing conditions (
cm) and on mv=2 sources. Collected data allows to
compare theoretical with observed temporal power spectra of the angle of arrival fluctuations, using
Kolmogorov model. Spatio-temporal seeing parameters met during observations (Fried parameter r0 and
coherence time t0) are estimated.
keywords: atmospheric effects -- instrumentation: interferometers -- methods: observational -- methods: data analysis -- techniques: interferometric