Photometric system

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In astronomy, a Photometric system is a set of discrete passbands (of filters), with a known sensitivity to incident radiation. The sensitivity usually depends on the optical system, detectors and filters used. For each photometric system a set of primary standard stars is provided.

The first known standardized photometric system is the Johnson-Morgan or UBV photometric system (1953). Nowadays there are more than 200 photometric systems.

Photometric systems are usually characterized according to the widths of their passbands:

  • broadband (passbands wider than 30 nm (the most widely used is Johnson-Morgan UBV system)),
  • intermediate band (passbands widths between 10 and 30 nm),
  • narrow band (passbands widths less than 10 nm).

[edit] References

  1. Johnson, H. L.; Morgan, W. W. (1953), Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas, The Astrophysical Journal, vol. 117, pp. 313-352
  2. The Asiago Database on Photometric Systems
  3. Michael S. Bessell (2005), STANDARD PHOTOMETRIC SYSTEMS, Annual Reviews of Astronomy and Astrophysics vol. 43, pp. 293–336
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