The empirical determination of damping constants in the solar photosphere |
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| Authors: | E A Gurtovenko G L Fedorchenko N N Kondrashova |
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| Institution: | (1) Main Astronomical Observatory, Ukrainian Academy of Sciences, Kiev, U.S.S.R.;(2) Astronomical Observatory, Kiev, University Kiev, U.S.S.R. |
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| Abstract: | We determine empirical damping constants for 73 selected Fe i lines following the method of Gurtovenko and Kondrashova (1980), employing high-quality observations and the accurate list of Fe i oscillator strengths by Gurtovenko and Kostik (1980).The results show: (i) No increase of the enhancement factor to van der Waals broadening with excitation potential, as predicted by Edmunds (1975), and with the frequency of the transition (Figure 1); (ii) a substantial part of the commonly-used enhancement factor for weaker lines is not due to collisional damping (Figure 2), but to a misrepresentation of the inhomogeneous structure of the deep photosphere. This false damping effect is not seen in the stronger lines which yield an average damping constant  : 1.36  1.5 6. |
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