SIMBAD references

A prototype of a low-cost adaptive optics (AO) system has been developed at the Instituto de Astrofisica de Andalucia (CSIC) and tested at the 2.2 m telescope of the Calar Alto Observatory. We present here the status of the project, which includes the image stabilization system and compensation of high-order wavefront aberrations with a membrane-deformable mirror. The image stabilization system consists of a magnet-driven tip-tilt mirror. The higher-order compensation system comprises a Shack-Hartmann sensor, a membrane-deformable mirror with 39 actuators, and the control computer, which allows operations up to 420 Hz in closed-loop mode. We have successfully closed the high-order AO loop on natural guide stars. An improvement of 4 times in terms of FWHM was achieved. The description and the results obtained on the sky are presented in this article.