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We present the results of NTT/VLT UBV imaging of a 260 square arcmin regioncontaining the Galactic Luminous Blue Variable WRA751, in search for itsbirth-cluster, i.e. a cluster of young and massive stars spatially andphysically associated with it. On the basis of the classical reddening-freeparameter Q, we have identified a sample of 24 early-type stars with colourstypical of spectral types earlier than B3. Interestingly, these stars areclustered within a radius of 1 arcmin from WRA751, corresponding to about 1% ofthe imaged field. These stars tightly distribute around (B-V) = 1.67, which inturn defines a mean extinction A(V) = 6.1 mag. The 5 brighter (V > 16.2) andbluer (Q < -0.9) stars of the sample have been subsequently observed with FORS1and classified as 3 late O- and 2 early B- stars. The absence of stars earlierthan O8 indicates an age of the cluster older than 4 Myr, although it could bedue to an incomplete sampling of the upper end of the main sequence.Nevertheless, the detection of OB stars of class I certainly indicates an ageof a few million years. At an assumed distance of 6 kpc, we estimate a clusterradius of 3.4 pc and a total mass of 2200 solar masses. Our discovery is onlythe second known instance of a Galactic Luminous Blue Variable associated withits birth-cluster.Comment: 8 pages, 6 figures, accepted by A&

The birth-cluster of the galactic luminous blue variable WRA 751