Name of the Speaker(s): A. Sillanpaa et al.
Institution: Tuorla Observatory FIN-21500 Piikkio Finland
Title of the communication: Some examples of the extremely close environments of BL Lac objects.
Preliminary abstract (12 lines max.):
Our ongoing programmes taking very deep images of different types of BL Lac objects with the Nordic Optical Telescope on La Palma have continued more than two years. In many cases we have observations with sub-arcsecond seeing and in some cases also with almost sub-half-arcsecond seeing. Some of the objects show extremely close companions. Preliminary results of these environments will be shown.