A Multi-Chanel Speckle Imaging for the DOT

Abstract

The Dutch Open Telescope (DOT) had its initial observing campaighn in September 1999. Alhough only a simple video system was used, the results demonstrated the excellent high-resolution capabilities of the combination of the open-teloscope concept, the DOT optics, the remaining image degradation due to the earth's atmosphere. The latter technique was therefore selected as primary DOT observing mode. The DOT data-acquisition system is now being rebuilt into multi-channel imaging optics with fast digital 10-bit cameras and large-volume speckle burst storage. It will simultaneously map the deep photosphere in the G band and the chromosphere in Ca II K and Ha. In addition, trial Doppler imaging in the Ba II 4554 line with a narrow-band (80 mÅ) Lyot filter from Irkutsk is so promising that usage of this filter is now planned as well.