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The influence of chemical ionization and chemical recombination processes on the plasma parameters in low-temperature layers of stellar atmospheres

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Abstract:

In this paper we have presented some of our preliminary results illustrating the influence of a group of symmetrical chemical ionization and chemical recombination processes on the populations of hydrogen-atom Rydberg states in low-temperature layers of stellar photospheres and a part of chromospheres. These processes are H*(n) + H(1s) → H2+ + e/H(1s) + H+ + e and H2+ + e → H*(n) + H(1s), H(1s) + H+ + e → H*(n) + H(1s), where H*(n) is the hydrogen atom in a Rydberg state with the principal quantum number n ≫ 1, and H2+ is the hydrogen molecular ion in a weakly bound rovibrational state. The mentioned processes have been considered within the framework of the semiclassical approximation, developed in several previous papers. Their influence on the populations of hydrogen-atom Rydberg states has been investigated by direct inclusion in a computer code for stellar atmosphere modelling. Here we present some of our preliminary results for the M dwarf atmospheres. Our results show that the influence of these processes is significant for the considered stellar atmospheres, so that they should be taken into account for their modelling.

Keywords: Chemical ionization; Chemical recombination; Collisional processes; Stellar plasma

Document Type: Research Article

DOI: https://doi.org/10.1080/1055679031000136445

Affiliations: 1: Queen's University Physics Department Belfast UK BT7 1NN 2: Institute of Physics PO Box 68 Belgrade Serbia 11080 3: University of Georgia Department of Physics and Astronomy and Center for Simulation Physics Athens Georgia USA 30602 4: Astronomical Observatory Volgina 7 Belgrade Serbia 11160

Publication date: 2003-08-01

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