Ionization from Excited States as a Cause of Nonstationary Populations of Hydrogen Levels Behind A Shock Front
| Autor: | K. V. Bychkov, O. M. Belova |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Shock wave
Physics Shock (fluid dynamics) Hydrogen 010308 nuclear & particles physics chemistry.chemical_element Astronomy and Astrophysics 01 natural sciences chemistry Excited state Ionization 0103 physical sciences Principal quantum number Physics::Atomic and Molecular Clusters Electron temperature Physics::Atomic Physics Atomic physics Ground state 010303 astronomy & astrophysics |
| Zdroj: | Astrophysics. 60:200-212 |
| ISSN: | 1573-8191 0571-7256 |
| DOI: | 10.1007/s10511-017-9475-8 |
| Popis: | It is shown that for the luminescence of hydrogen in shock fronts in the atmospheres of stars in late spectral classes, the level populations of the hydrogen atoms are determined by the entire prehistory of the process, beginning with heating in the shock front, as well as by the instantaneous electron temperature and density. Ionization from excited states with principal quantum numbers 2 ≤ k ≤ 6 plays an important role. The role of highly excited states of hydrogen atoms as they are ionized in shock fronts under the conditions of stellar atmospheres is clarified. The contribution of states with k > 10 to the ionization rate can substantially exceed the rate of ionization from the ground state. |
| Databáze: | OpenAIRE |
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