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 (firstname.lastname@example.org)
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