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Paper: Standardization in the Classical UBV RI Photometric System
Volume: 364, The Future of Photometric, Spectrophotometric, and Polarimetric Standardization
Page: 27
Authors: Landolt, A.U.
Abstract: There occur projected against the celestial sphere a wide range of phenomena for which observers and experimenters need intensity and color information. A fundamental datum for celestial objects is their intensity measured along the electromagnetic spectrum. Through considered choices of filters, one may establish photometric systems which isolate portions of the spectrum, and such systems in turn may be used to define color indices. Therefore, there is a long-term need for accurate photometric standard stars, those with known intensities and color indices at a variety of wavelengths.

References to history will set the stage for introduction of the UBV RI photometric system. It provides a common thread with previous centuries of photometry, and can provide similar continuity to the future. Much of this contribution will be a discussion of a set of procedures which may be followed, and some of the pitfalls that may be encountered, in establishing a useful optical photometric system.

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