HI OBSERVATIONS OF BINARY SPIRAL GALAXIES

Observations in the 21 cm line of neutral hydrogen made with the Areci bo- and the Westerbork radio telescopes are presented of a sample of b inary spiral galaxies. Completed with optical information, these obser vations are used to determine the spatial orientation of the spin-vect ors of the galaxies and to estimate their systemic- and rotation veloc ities. These data are used in an accompanying paper to study the angul ar momentum properties of binary spiral galaxies in the context of gal axy formation.