A. A. Mihajlov et al. 2003 ApJS 147 369 doi:10.1086/375621
Symmetrical Chemi-Ionization and Chemi-Recombination Processes in Low-Temperature Layers of Helium-rich DB White Dwarf Atmospheres
FREEA. A. Mihajlov1, Lj. M. Ignjatović1, M. S. Dimitrijević2 and Z. Djurić3
Show affiliationsThe influence of symmetrical chemi-ionization and chemi-recombination processes on the helium atom Rydberg states' population in weakly ionized layers of helium-rich DB white dwarfs has been investigated. The ionization processes in He*(n) + He(1s2) collisions and their inverse recombination processes He
+ e and He(1s2) + He+ + e have been considered in domains of principal quantum numbers n ≥ 3 and temperatures 12,000 K ≤ Teff ≤ 30,000 K. These processes have been treated within the frame of the semiclassical theory developed earlier. Their contributions to the Rydberg state populations have been compared with electron-electron-ion recombination, electron-excited atom ionization, and electron-ion photorecombination processes. Results showed that these processes can be dominant ionization/recombination mechanisms in helium-rich DB white dwarf atmosphere layers for log g = 7 and 8 and Teff ≤ 20,000 K and have to be implemented in relevant models of weakly ionized helium plasmas.
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Issue 2 (2003 August)
Received 2002 December 12, accepted for publication 2003 March 28
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Symmetrical Chemi-Ionization and Chemi-Recombination Processes in Low-Temperature Layers of Helium-rich DB White Dwarf Atmospheres
A. A. Mihajlov et al. 2003 ApJS 147 369
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