Influence of chemi-ionization and chemi-recombination processes on the population of hydrogen Rydberg states in atmospheres of late type dwarfs

Details Influence of chemi-ionization and chemi-recombination processes on the population of hydrogen Rydberg states in atmospheres of late type dwarfs Influence of chemi-ionization and chemi-recombination processes on the population of hydrogen Rydberg states in atmospheres of late type dwarfs

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403..787m&link_type=abstract

Astronomy and Astrophysics, v.403, p.787-791 (2003)

Astronomy and Astrophysics

Astrophysics

11

Atomic Processes, Molecular Processes, Stars: Late Type

Scientific paper

We study the influence of a group of chemi-ionization and chemi-recombination processes on the populations of higher states of hydrogen in the layers of a stellar atmosphere. The group of processes includes ionization: H*(n)+H(1s)==> H2++e , H*(n)+H(1s)==> H(1s)+H++e, and inverse recombination: H2++e==> H*(n)+H(1s), H(1s)+H++e==> H*(n)+H(1s), where H*(n) is the hydrogen atom in a state with the principal quantum number n >> 1, and H2+ is the hydrogen molecular ion in a weakly bound rho-vibrational state of the ground state. These processes have been treated within the framework of the semi-classical approximation, developed in several previous papers, and have been included in the general stellar atmosphere code PHOENIX. We present results for an M dwarf atmosphere with Teff = 3800 K and find that the inclusion of chemi-ionization and chemi-recombination processes is significant in the low temperature parts of the atmosphere.

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