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The results of the Koenigstuhl survey in the Southern Hemisphere arepresented. I have searched for common-proper motion companions to 173 fieldvery low-mass stars and brown dwarfs with spectral types > M5.0V and magnitudesJ <= 14.5 mag. I have measured for the first time the common-proper motion oftwo new wide systems containing very low-mass components, Koenigstuhl 2 AB and3 A-BC. Together with Koenigstuhl 1 AB and 2M0126-50AB, they are among thewidest systems in their respective classes (r = 450-11900 AU). Koenigstuhl 3A-BC contains a well-known F8V star and a M8.0+L3.0V tight binary. I havedetermined the minimum frequency of field wide multiples (r > 100 AU) withlate-type components at 5.0+/-1.8 % and the frequency of field wide late-typebinaries with mass ratios q > 0.5 at 1.2+/-0.9 %. These values represent a keydiagnostic of evolution history and low-mass star and brown-dwarf formationscenarios. Additionally, the proper motions of 76 field very low-mass dwarfsare measured here for the first time.

Southern wide very low-mass stars and brown dwarfs in resolved binary and multiple systems