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High-Precision Photometry

Published online by Cambridge University Press:  12 April 2016

A.T. Young
A.T. Young*
Affiliation:
European Southern Observatory, Garching bei München, GermanyandSan Diego State University, San Diego, California, USA

Abstract

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The current precision of differential comparisons, within a fixed instrumental system, reaches about a millimagnitude. The current accuracy of transformations between systems is on the order of 0.01 mag, but is worse in some cases. The transformation errors are due to mis-matches between instrumental and standard systems, and cannot be transformed away without further information. A simple geometric model is proposed, which illuminates the transformation problem, and suggests means of minimizing it. Misplaced band edges are the main cause; tighter specifications on filters will help to reduce these errors. The ultimate solution is to use sampled systems in which some bands look like the derivatives of their neighbors. This automatically produces enough band overlap to comply reasonably well with the sampling theorem.

Type
Session 2 High Precision Photometry
Information
International Astronomical Union Colloquium , Volume 136: Stellar Photometry – Current Techniques and Future Developments , 1993 , pp. 80 - 91
Copyright
Copyright © C.J. Butler and I. Elliottt 1993

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