Single Star Scidar first light from Dome C

Details Single Star Scidar first light from Dome C Single Star Scidar first light from Dome C

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iauss...7e...8v&link_type=abstract

Astronomy in Antarctica, 26th meeting of the IAU, Special Session 7, 22-23 August, 2006 in Prague, Czech Republic, SPS7, #8

Astronomy and Astrophysics

Astronomy

Scientific paper

Here, we present the SSS first light from Dome C Antarctica. Results obtained during Chadid's expedition in the Summer Season 2005-2006 . The alpha Car observations are obtained during the day and using a 40 cm telescope. The SSS "Single Star Scidar" technique derives from the so-called Scidar (SCIntillation Detection and Ranging) technique, which analyses the scintillation, on the entrance pupil of a telescope, of a double star. The scientific goal is to measure vertical profiles of the Optical Turbulence C_N ^2 (h) and the wind speed *V*(h) at Dome C from the scintillation of a single star. From those two profiles it is possible to deduce almost all the parameters which can help to optimize all the instruments devoted to High Angular Resolution Astronomy, such as Adaptive Optics and Interferometry. The SSS at Dome C is composed of a 40 cm telescope driven by an equatorial mount. A short focal lens is used to collimate the optical beam, and the defocussed image of the telescope pupil is acquired by a CCD. Several thousands of images are analyzed in real time to deliver spatio-temporal cross correlations. Each few tens of seconds, such a correlation is stored in order be processed off line with the "simulated annealing" method. The development and construction of this instrument was made possible with help of: Air Force Office of Scientific Research and the European Office of Aerospace Research and Development (USA), Programmes Internationaux de Cooperation Scientifique, INSU and CNRS contracts, a European "ELT Design Study" contract, the IPEV infrastructure and financing, AFRL-VSBYA (USA), IAC (Spain) and ANR "CASDOA" contract.

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