Abstract
During this symposium we have already heard papers which have dealt with the calibration of certain spectral parameters. In this session we turn to the matter of calibrating luminosity criteria in terms of absolute magnitude. This is a central problem in studies of our Galaxy and it finds in this topic its widest application. At the same time we remind ourselves that the determination of absolute magnitude is necessary in studies of stellar structure and stellar evolution since this information tells us about the radiation passing through the stellar interior and the stellar atmosphere and of the amount of energy generated by the star. The luminosity also allows us to calculate the size of a star and to estimate its surface gravity.
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