Symmetrical Chemi-Ionization and Chemi-Recombination Processes in Low-Temperature Layers of Helium-rich DB White Dwarf Atmospheres

Details Symmetrical Chemi-Ionization and Chemi-Recombination Processes in Low-Temperature Layers of Helium-rich DB White Dwarf Atmospheres Symmetrical Chemi-Ionization and Chemi-Recombination Processes in Low-Temperature Layers of Helium-rich DB White Dwarf Atmospheres

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apjs..147..369m&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 147, Issue 2, pp. 369-377.

Astronomy and Astrophysics

Astronomy

11

Atomic Processes, Stars: Atmospheres, Stars: White Dwarfs

Scientific paper

The 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+2+e and He(1s2)+He++e have been considered in domains of principal quantum numbers n>=3 and temperatures 12,000K<=Teff<=30,000K. 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 logg=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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