On-sky results of the adaptive optics MACAO for the new IR-spectrograph   CRIRES at VLT
  The adaptive optics MACAO has been implemented in 6 focii of the VLT observatory, in three different flavors. We present in this paper the results obtained during the commissioning of the last of these units, MACAO-CRIRES. CRIRES is a high-resolution spectrograph, which efficiency will be improved by a factor two at least for point-sources observations with a NGS brighter than R=15. During the commissioning, Strehl exceeding 60% have been observed with fair seeing conditions, and a general description of the performance of this curvature adaptive optics system is done. 
J. Paufique, P. Biereichel, B. Delabre, R. Donaldson, R. Esteves, E.   Fedrigo, P. Gigan, D. Gojak, N. Hubin, M. Kasper, U. ...