Source Functions in the Cores of Infrared Fraunhofer Lines
If the profiles of all Fraunhofer lines were formed according to the mechanism of pure absorption (the L.T.E.-hypothesis) the source functions Sλ(τ) deduced empirically from the central intensities of these lines should all be identical, and equal to the blackbody function Bλ(τ). In order to examine this hypothesis the source functions Sλ(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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