The influence of chemical ionization and chemical recombination processes on the plasma parameters in low-temperature layers of stellar atmospheres
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.
Document Type: Research Article
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