Atmospheric extinction of U−B photometry |
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| Authors: | A W J Cousins J A R Caldwell |
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| Institution: | South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa |
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| Abstract: | Bouguer lines have been used to measure the atmospheric extinction of U ? B , and two approaches to correcting U ? B for the atmosphere are examined. We find that the conventional photometric reductions may be sufficiently accurate when the range of airmass is small enough (in terms of a maximum hazarded error of 0.04 mag per airmass), but we recommend the use of a colour term in the correction for U ? B extinction when this condition is not satisfied. |
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| Keywords: | techniques: photometric |
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