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

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

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..125..367r&link_type=abstract

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

Astronomy and Astrophysics

Astronomy

1

Atmospheric Effects, Instrumentation: Interferometers, Methods: Observational, Methods: Data Analysis, Techniques: Interferometric

Scientific paper

The Active Stabilization in Stellar Interferometry (ASSI) recombining table, developed at Office National d'Etudes et de Recherches Aerospatiales (ONERA), France, was implemented on the two-Telescope Interferometer (I2T) of the Observatoire de la Cote d'Azur (OCA) in 1993, compensating for the atmospheric turbulence wavefront fluctuations. Initial fringe observation ns 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 +/-0.24 arcsec was achieved in typical seeing conditions (r_0 >= 10 cm) and on m_v=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 r_0 and coherence time t_0) are estimated.

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