No CrossRef data available.
Published online by Cambridge University Press: 04 August 2017
In this review an examination will be made of the experimental conditions which must be satisfied by multicolor photometric systems if the observational parameters are to be correlated unequivocally with physical quantities of the star. An inventory of error sources disturbing such calibrations contains: instability of the natural system, procedures of observation and reduction to outside the atmosphere and correlation with a standard system. The requirements desirable for the preparation of lists of standard stars, for the definition of the pass bands, for the “orthogonality” of the calibrated parameter, for the definition of the domain of validity of the calibration are listed. Some remarks are made on the concepts of “open” or “closed” calibrations.