LuckyCam B r' z' colour images of the core of M3 (back to homepage) nlaw at ast.cam.ac.uk

An example of Lucky Imaging in the blue. These images of the core of the globular cluster M3 are colour composites with B-band as blue, SDSS r' as green and SDSS z' as red, and they are roughly one arcminute in width (taken in rather poor seeing). They span the visible spectrum and extend a little into the infrared. Lucky Imaging works rather well in all these bands (although it does work much better with the redder light).

Generally the system works best in I-band and redder, but these images show that surprisingly large improvements can be made at most wavelengths.

Lucky Imaging - 5% selection from 2000 frames @ 20 frames per second. Taken on the 2.5m Nordic Optical Telescope, June 2005 (click for larger version).
Equivalent image seen with a (simulated) autoguider. The NOT autoguider has a well-understood behaviour and a response time which is well sampled by LuckyCam's frame rate. This allows us to simulate the pointing commands that would be generated by the autoguider; a summed image can then be constructed from the LuckyCam data using the simulated pointing positions, allowing a simultaneous comparison of the two systems. In this case not all of the wind shake is taken out by the auotguider, leading to slightly elongated images (click for larger version).