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Astrophysics and Space Science

, Volume 37, Issue 2, pp 263–273 | Cite as

Effects of Thomson scattering on the shape of a spectral line

  • Marco Missana
  • Attilio Piana
Article

Abstract

The effect of Thomson scattering and Compton effect on the shape of a spectral line is studied in the case of a plane-parallel atmosphere. The theoretical values of red shift and intensity at the top of the line, having an equivalent width 5√π10−10 cm, and of the red asymmetry are tabulated for 62 different values of the optical thickness τ′; from τ′=0.2/√3 to τ′=2.6/√3.

The case of solar atmosphere is considered and it is shown that all main features of the observed red shifts can be interpreted by means of a scattering theory, with an error smaller than one milliängström. The need of further measurements is pointed out.

Keywords

Atmosphere Spectral Line Optical Thickness Solar Atmosphere Equivalent Width 
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

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • Marco Missana
    • 1
    • 2
  • Attilio Piana
    • 3
  1. 1.Institute of AstronomyCambridgeEngland
  2. 2.Observatorio Astronomico di BreraMerateItaly
  3. 3.Instituto di MatematicaTorino

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