Abstract
The temperature sensitivity of the equivalent width, w/sub 0/, of the photospheric line C I 5380.3 in a static system has been determined from observations and found to be in fair agreement with theoretical results. For an oscillating system, the ratio of the amplitude of the modulated part of the central line depth, r/sub 0/, to the velocity amplitude was obtained from observations of the 5-minute oscillation. The temperature sensitivity of r/sub 0/, in this oscillating system was obtained from this ratio and from the relevant solutions for acoustic waves propagation in the photosphere. This sensitivity was found to be essentially two orders of magnitude below that for the static system, diminishing the utility of this spectral line in a program looking for global oscillations. Implicit in this work is the use of relatively large temperature amplitudes deep in the photosphere. These amplitudes have been found theoretically to be associated with the 5-minute oscillations as a direct manifestation of the k-mechanism operating in the hydrogen ionization zone.
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