Journal
ASTRONOMY & ASTROPHYSICS
Volume 610, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201731968
Keywords
atomic data; atomic processes; line: formation; Sun: abundances; stars: abundances
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Funding
- Swedish Research Council
- Knut and Alice Wallenberg Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1153335] Funding Source: National Science Foundation
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Excitation and charge transfer in low-energy O+H collisions is studied; it is a problem of importance for modelling stellar spectra and obtaining accurate oxygen abundances in late-type stars including the Sun. The collisions have been studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals (LCAO) model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multichannel Landau-Zener model. The method has been extended to include configurations involving excited states of hydrogen using an estimate for the two-electron transition coupling, but this extension was found to not lead to any remarkably high rates. Rate coefficients are calculated for temperatures in the range 1000-20000 K, and charge transfer and (de) excitation processes involving the first excited S-states, 4s.S-5(0) and 4s.S-3(0), are found to have the highest rates.
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