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Atoms 2018, 6(1), 1; doi:10.3390/atoms6010001

Symmetric Atom–Atom and Ion–Atom Processes in Stellar Atmospheres

1
Institute of Physics, University of Belgrade, Pregrevica 118, Zemun, 11080 Belgrade, Serbia
2
Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia
3
LERMA, Observatoire de Paris, UMR CNRS 8112, UPMC, 92195 Meudon CEDEX, France
*
Author to whom correspondence should be addressed.
Received: 7 September 2017 / Revised: 9 December 2017 / Accepted: 19 December 2017 / Published: 21 December 2017
(This article belongs to the Special Issue Spectral Line Shapes in Astrophysics and Related Topics)
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Abstract

We present the results of the influence of two groups of collisional processes (atom–atom and ion–atom) on the optical and kinetic properties of weakly ionized stellar atmospheres layers. The first type includes radiative processes of the photodissociation/association and radiative charge exchange, the second one the chemi-ionisation/recombination processes with participation of only hydrogen and helium atoms and ions. The quantitative estimation of the rate coefficients of the mentioned processes were made. The effect of the radiative processes is estimated by comparing their intensities with those of the known concurrent processes in application to the solar photosphere and to the photospheres of DB white dwarfs. The investigated chemi-ionisation/recombination processes are considered from the viewpoint of their influence on the populations of the excited states of the hydrogen atom (the Sun and an M-type red dwarf) and helium atom (DB white dwarfs). The effect of these processes on the populations of the excited states of the hydrogen atom has been studied using the general stellar atmosphere code, which generates the model. The presented results demonstrate the undoubted influence of the considered radiative and chemi- ionisation/recombination processes on the optical properties and on the kinetics of the weakly ionized layers in stellar atmospheres. View Full-Text
Keywords: atomic processes; molecular processes; radiative transfer; absorption quasi-molecular bands; sun:atmosphere; sun:photosphere; stars:atmospheres; white dwarfs atomic processes; molecular processes; radiative transfer; absorption quasi-molecular bands; sun:atmosphere; sun:photosphere; stars:atmospheres; white dwarfs
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Srećković, V.A.; Ignjatović, L.M.; Dimitrijević, M.S. Symmetric Atom–Atom and Ion–Atom Processes in Stellar Atmospheres. Atoms 2018, 6, 1.

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