Astrophysics

, Volume 61, Issue 1, pp 101–112 | Cite as

Stability of Nonstationary Cooling of Pure Hydrogen Gas with Respect to the Number of Discrete Levels Taken into Account

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The effect of the number K of atomic hydrogen levels taken into account on the cooling of the gas behind a shock front is studied. The calculations are done for the conditions in the atmospheres of long-period Mira Ceti type variables. K ranges from 2 to 25. The electron temperature Te(t; K) and ionization state x(r,K) asymptotically approach limiting functions Te(t) and x(t) that are independent of K. After the maximum electron temperature is reached, a partial equilibrium phase sets in, during which the populations of the highly excited discrete levels with principal quantum numbers ≥ 8 obey the Saha equation for the instantaneous electron temperature and density.

Keywords

shock wave: long-period variables: stellar atmospheres 

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Physics FacultyM. V. Lomonosov Moscow State UniversityMoscowRussia
  2. 2.P. K. Shternberg Institute of AstronomyM. V. Lomonosov Moscow State UniversityMoscowRussia

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