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


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.


Atmosphere Spectral Line Optical Thickness Solar Atmosphere Equivalent Width 
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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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