Combined color indexes and photometric structure of galaxies NGC 834 and   NGC 1134
  We present the results of BVRI photometry of two galaxies with active star formation: NGC 834 and NGC 1134. Combined color index Q_{BVI} was used to investigate the photometrical structure of the galaxies. Index Q_{BVI} is not affected by internal extinction and is sensitive to the presence of blue stars.   Ring-like region with active star formation at 15" from the center reveals itself in the Q_{BVI} map of NGC 834. Three-arm spiral structure is well-seen on the Q_{BVI} map of NGC 1134.   We propose to use the combined indexes Q_{BVI} and similarly defined indices as a tracers of Star Formation activity and structure of dusty galaxies. 
D.Bizyaev, A.Zasov (Sternberg Astronomical Institute) and S.Kajsin   (Special Astrophysical Observatory of RAS)