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.