Source Functions in the Cores of Infrared Fraunhofer Lines

  • C. De Jager
  • L. Neven
Conference paper


If the profiles of all Fraunhofer lines were formed according to the mechanism of pure absorption (the L.T.E.-hypothesis) the source functions (τ) deduced empirically from the central intensities of these lines should all be identical, and equal to the blackbody function (τ). In order to examine this hypothesis the source functions (τ) were deduced empirically according to a method applied earlier by us (De Jager and Neven, 1967a) for some twenty infrared lines for which accurate centre-limb observations were available (De Jager and Neven, 1967b). The lines belonged to five different multiplets.


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  1. De Jager, C. and Neven, L.: 1967a, Solar Physics, 1, 27.ADSGoogle Scholar
  2. De Jager, C. and Neven, L.: 1967b, Bull. Astron. Inst. Netherlands, Suppl. Series 1 (no. 8), 325.ADSGoogle Scholar

Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1968

Authors and Affiliations

  • C. De Jager
    • 1
  • L. Neven
    • 2
  1. 1.University Observatory and Space Research LaboratoryUtrechtThe Netherlands
  2. 2.Royal Belgian ObservatoryUccle-BrusselsBelgium

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