Te I Stark broadening data for stellar plasma analysis

Abstract

In spite of the fact that tellurium is one of the least abundant element in the Earth's litosphere, its cosmic abundance is larger than for any element with atomic number greater than 40, and its spectral lines are observed in stellar spectra. Since the significance of trace element spectral data, including Stark broadening parameters, increases with the development of space‐born spectroscopy, we investigate here theoretically the influence of collisions with charged particles on spectral lines of neutral tellurium. By using the semiclassical perturbation method, Stark widths and shifts of three Te I spectral lines, of interest for modellisation, investigation and diagnostic of stellar plasma have been obtained. Results were applied for the investigation of the influence of Stark broadening mechanism in ultraviolet, optical and infrared part of the spectrum of A‐type star atmospheres. The obtained results demonstrate that, in the considered case, Stark broadening is more important in optical and infrared, than in the ultraviolet part of the spectrum, and that this effect should be taken into account for the considered, A‐type stellar atmosphere model.