Strömgren and Hβ photometry of O and B type stars in star-forming regions - III. Carina Spiral FeatureN. T. Kaltcheva, E. H. Olsen and J. V. ClausenAstron. Astrophys. Suppl. Ser., 146 3 (2000) 365-372DOI: https://doi.org/10.1051/aas:2000364