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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.

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Authors and Affiliations

  1. Physics Faculty, M. V. Lomonosov Moscow State University, Moscow, Russia

    O. M. Belova

  2. P. K. Shternberg Institute of Astronomy, M. V. Lomonosov Moscow State University, Moscow, Russia

    K. V. Bychkov

Authors
  1. O. M. Belova
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  2. K. V. Bychkov
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Corresponding author

Correspondence to O. M. Belova.

Additional information

Translated from Astrofizika, Vol. 61, No. 1, pp. 119-130 (February 2018).

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Belova, O.M., Bychkov, K.V. Stability of Nonstationary Cooling of Pure Hydrogen Gas with Respect to the Number of Discrete Levels Taken into Account. Astrophysics 61, 101–112 (2018). https://doi.org/10.1007/s10511-018-9519-8

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  • DOI: https://doi.org/10.1007/s10511-018-9519-8

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