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Extinction and transformation

  • Andrew T. Young
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 341)

Abstract

The basic principles of heterochromatic extinction show that the approach used in the visible should not work well in the infrared, where molecular line absorption rather than continuous scattering dominates the extinction. Not only does this extinction change very rapidly with wavelength (so that stellar color becomes only weakly correlated with effective extinction), but also many of the lines are saturated (so that Forbes's curve-of-growth effect is much more severe in the IR.) Furthermore, broadband IR colors are more under-sampled than those in the visible, so aliasing errors make them correlate even less with extinction, and enhance the difficulties of transformation to a standard system. Reduction to outside the atmosphere is difficult, but a rational approximation for the Forbes effect may help. Plausible assumptions about the probability distribution function of line strengths, and band-model approaches, may be useful. The only solution to the transformation problem is to satisfy the sampling theorem, which may be difficult in the IR because of gaps due to saturated telluric absorptions.

Keywords

Extinction Curve Photometric System Color Term Atmospheric Extinction Effective Extinction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Andrew T. Young
    • 1
  1. 1.Astronomy DepartmentSan Diego State UniversitySan Diego

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