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A&AS Supplement Series, Vol. 125, October II 1997, 367-380

Received October 9; accepted December 23, 1996

Performance of the angle of arrival correction system of the I2T + ASSI stellar interferometer

S. Robbe tex2html_wrap1679, B. Sorrentetex2html_wrap1681, F. Cassaingtex2html_wrap1681, Y. Rabbiatex2html_wrap1679, and G. Roussettex2html_wrap1681

Send offprint request: S. Robbe (
tex2html_wrap552  Observatoire de la C\164te d'Azur, Fresnel Department, UMR 6528, Av. Copernic, 06130 Grasse, France
tex2html_wrap552  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 tex2html_wrap_inline1659 arcsec was achieved in typical seeing conditions (tex2html_wrap_inline1661 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

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