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A new technique allowing the Q-method to be used surely for both the spectral classication of young O{A0 stars and older spectral subclasses A1{M5 is de- scribed. Characteristics of interstellar light absorption de- pendence on distance in the given direction of the sky is used as a main criterion for excluding possible mul- tiplicity of star spectral estimates at some constant val- ues of QUBV . Information on open cluster membership probabilities is also useful as additional criterion of the spectral classication. The method was tested on stars up to V = 14 mag in directions of young open clusters NGC 2244 and NGC 2264. The spectral study based on UBV photometry was extended to faint stars of NGC 2264 in the V magnitude range 17 22 mag.

Spectral classification of O–M stars on the basis of UBV photometry