  In the SACY (Search for Associations Containing Young-stars) project we try
to identify associations of stars younger than the Local Association among
HIPPARCOS and/or TYCHO-2 stars later than G0 which are counterparts of the
ROSAT X-ray bright sources. High-resolution spectra for the possible optical
counterparts were obtained in order to assess both the youth and the spatial
motion of each target. More than 1000 ROSAT sources were observed, covering a
large area in the Southern Hemisphere. Associations are characterized mainly by
the similarity in UVW velocity space of their proposed member, but other
parameters, as evolutionary age, Li abundance and distribution in space must
also be taken into account. We proposed a method to identify associations when
proper motions and radial velocities are available, but no parallaxes. Using
the method we found eleven associations in the SACY data.
