A catalog of OB associations in the spiral galaxy NGC 300

We present results of a search for OB associations in NGC 300. Using an aut omatic and objective method (PLC technique) 117 objects were found. Statist ical tests indicate that our sample is contaminated by less than 10 detecti ons due to random concentrations of blue stars. Spatial distributions of de tected associations and H II regions are strongly correlated. The size dist ribution reveals a significant peak at about 60 mu rad which corresponds to 125 parsecs if a distance modulus of 26.66 mag is assumed. Besides the obj ects with sizes corresponding to typical associations we also found several much larger objects. A second level application of our detection method re vealed that most of these are composed of smaller subgroups, with sizes of about 100 pc.