Extinction and transformation

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


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.


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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Blanco, V. M. Band-width effects in photoelectric photometry. Ap. J. 125, 209–212 (1957)Google Scholar
  2. Cousins, A. W. J., and Jones, D. H. P. Numerical simulation of natural photometric systems. Mem. R. Astron. Soc. 81, 1–23 (1976)Google Scholar
  3. Forbes, J. D. On the transparency of the atmosphere and the law of extinction of the solar rays in passing through it. Phil. Trans. 132, 225–273 (1842)Google Scholar
  4. Guthnick, P., and Prager, R. Photoelektrische Untersuchungen an spektroskopischen Doppelsternen und an Planeten. Verőff. Kgl. Sternwarte Berlin-Babelsberg 1, 1–68 (1914)Google Scholar
  5. Hardie, R.H. in IAU Symp. 24, Spectral Classification and Multicolour Photometry (Academic, New York, 1966) p.243Google Scholar
  6. King, I. Effective extinction values in wide-band photometry. Astron. J. 57, 253–258 (1952)Google Scholar
  7. Manduca, A., and Bell, R. A. Atmospheric extinction in the near infrared. Pub. A. S. P. 91, 848 (1979)Google Scholar
  8. Mandwewala, N. J. Analysis of Rufener's method for the atmospheric extinction reduction. Publ. Obs. Genève Ser. A, Fasc. 82 (Arch. Sci., Genève 29) 119–148 (1976)Google Scholar
  9. Manfroid, J., and Heck, A. A generalized algorithm for efficient photometric reductions. Astron. Astrophys. 120, 302–306 (1983)Google Scholar
  10. Manfroid, J. “On photometric standards and color transformation” in I.A.U. Symposium 111, Calibration of Fundamental Stellar Quantities, edited by A. G. Davis Philip. (Reidel, Dordrecht, 1985) pp. 495–497Google Scholar
  11. Rufener, F. Technique et réduction des mesures dans un nouveau système de photometrie stellaire. Pub. Obs. Genève, Sér. A, Fasc. 66 (1964)Google Scholar
  12. Schnaidt, F. Berechnung der relativen Schichtdicken des Wasserdampfes in der Atmosphäre. Meteorol. Z. 55, 296–299 (1938)Google Scholar
  13. Strőmgren, B. in Handbuch der Experimentalphysik Band 26, Astrophysik, edited by B. Strőmgren (Akademische Verlagsgesellschaft, Leipzig, 1937) pp. 321–564Google Scholar
  14. Young, A. T., and Irvine, W. M.0 Multicolor photoelectric photometry of the brighter planets. I. Program and procedure. Astron. J. 72, 945–950 (1967)Google Scholar
  15. Young, A. Methods of Experimental Physics, Vol.12 (Astrophysics, Part A: Optical and Infrared), edited by N. Carleton (Academic Press, New York, 1974) pp. 123–192Google Scholar
  16. Young, A. T. in Proceedings of the Second Workshop on Improvements to Astronomical Photometry (NASA, 1988)Google Scholar

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

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

Personalised recommendations