Titlebook: Astronomical Photometry; A Guide Chr. Sterken,J. Manfroid Book 1992 Springer Science+Business Media Dordrecht 1992 astronomy.instruments.ob

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Atmospheric turbulence: scintillation and seeing,y be approximately considered to consist of a constant term, and of a variable quantity. The constant part of attenuation of light is the extinction, whereas the constant term of the deflection of light is the refraction. The rapid variations are random fluctuations—respectively called . and .—which

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Color transformation,d with standard data obtained at other sites with other telescopes, other filters and other detectors. Even when one works in a well-established system, such as the Johnson- Morgan . system (see Chapter 16), the instrumental responses of various equipments are seldom identical, i.e., the ratio of th

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Infrared photometry,e spectrum than is the visible. While the visible region covers all wavelengths to which our eyes are sensitive, the infrared deals with radiation beyond the red cut-off wavelength of the visible domain, say from about 800 nm up to about 1 mm. Beyond 800 nm the human sensory system switches from the

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Charge-coupled devices,uster lies inside the diaphragm all contributions are automatically added. At the same time the sky background is also included in every measurement, making necessary separate observations of the background. Consequently the objects have to be measured sequentially. But there exist two-dimensional d