[Previous] | [Session 101] | [Next]
T. H. Robertson (Ball State University)
A database has been constructed which contains UBVRI photometry on the Kron-Cousins system for approximately 2500 stars. The database includes only observations made with photoelectric photometers and filters designed to reproduce the Kron-Cousins R and I magnitudes. These data have been used to construct (B-V) - (V-I) diagrams for red stars to evaluate the limitations of luminosity classification using this diagram. For this application observations of known binary and double stars were removed. Stars were grouped by luminosity class and mean polynomial relations for giant and dwarf star sequences were computed. An algorithm for computing luminosity class from the photometry was computed. Problems associated with stellar variability, multiplicity, interstellar reddening and chemical abundance variations are discussed in the context of the application of this diagram for luminosity classification.