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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. 342-347
Study of Stellar Populations in M 33 OB Associations
N. Koleva1, T. Veltchev1, L. Vassileva2, G. Borisov2, P. Nedialkov1
1Department of Astronomy, Faculty of Physics, University of Sofia, 5 James Bourchier Blvd., 1164 Sofia, Bulgaria
2Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
go back1Department of Astronomy, Faculty of Physics, University of Sofia, 5 James Bourchier Blvd., 1164 Sofia, Bulgaria
2Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
Abstract. Young stellar populations are investigated in 17 classical OB associations/complexes in M 33, using precise UBVRI photometry from the recently published Local Group Survey (Massey et al. 2005). The star formation history in the associations is reconstructed roughly on the base of age and extinction estimates.