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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.34 no.s2 (2007), pp. 415-419
Clustering of Young Stellar Groups in M 33 Galaxy
L. Vassileva1, T. Veltchev2, G.R. Ivanov2, Ts. Georgiev1, P. Nedialkov2
1Institute of Astronomy, Bulg. Acad. Sci., Sofia 1784, Bulgaria
2Department of Physics , Sofia University, 1164 Sofia, 5 J. Bourchier Blvd.
go back1Institute of Astronomy, Bulg. Acad. Sci., Sofia 1784, Bulgaria
2Department of Physics , Sofia University, 1164 Sofia, 5 J. Bourchier Blvd.
Abstract. We perform dereddening and obtain age estimates of 26 306 stars in M33, using precise UBVRI photometry of the recently published Local Group Survey. The clustering of the massive stellar population is studied through simple technique, assuming range of typical densities for stellar associations and clusters. The classical OB associations seem to be spatial superpositions of clusters of several young generations with different ages.