DOI: https://doi.org/10.30970/jps.02.16
A TEMPERATURE DEPENDENCE OF THE WIDTH OF THE ATOM SPECTRAL LINES IN STELLAR ATMOSPHERES
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Journal of Physical Studies 2(1), 16–22 (1998)
DOI: https://doi.org/10.30970/jps.02.16 A TEMPERATURE DEPENDENCE OF THE WIDTH OF THE ATOM SPECTRAL LINES IN STELLAR ATMOSPHERES |
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I. O. Vakarchuk, R. E. Rykalyuk, L. M. Yankiv-Vitkovska
Lviv State University, Chair of Theoretical Physics
12 Drahomanov Str., Lviv, UA-290005, Ukraine
Explicit expressions for the damping constant $γ$ and the frequency shift $Δ$ of Lorentz's profile of absorption coefficient in spectral lines with the consideration of inelastic collisions and post Van der Waals interpretations of the radiating atom with exciting particles have been found. The inelastic collisions are characterized by a constant parameter which equals the relation of an imaginary part of the scattering phase to the real one. For the $γ/γ_0$ value where $γ_0$ is a Van der Waals damping constant in approximation of Weisskopt–Lindholm, there were received two types of expansions over the powers of temperature. Considering these effects leads to an increase of the damping constant and is enough for obtaining quantitative results for Fraunhofer's lines profiles without any illegitimate increase of the value of $γ$ (the so called empirical damping constant) ‟by the hand" which is used in the analysis of stellar spectra.