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The physical properties of almost any kind of astronomical object can bederived by fitting synthetic spectra or photometry extracted from theoreticalmodels to observational data.  We want to develop an automatic procedure to perform this kind of fittings toa relatively large sample of members of a stellar association and apply thismethodology to the case of Collinder 69.  We combine the multiwavelength data of our sources and follow a work-flow toderive the physical parameters of the sources. The key step of the work-flow isperformed by a new VO-tool, VOSA. All the steps in this process are done in aVO environment.  We present this new tool, and provide physical parameters such as T$_{\rmeff}$, gravity, luminosity, etc. for $\sim$170 candidate members to Collinder69, and an upper-limit for the age of this stellar association.  This kind of studies of star forming regions, clusters, etc. produces a hugeamount of data, very tedious to analyse using the traditional methodology.Thus, they are excellent examples where to apply the VO capabilities.

VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster