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Astrophysics

, Volume 61, Issue 2, pp 224–240 | Cite as

Effect of Photospheric Radiation on the Upper Layers of a Star’s Atmosphere

  • O. M. Belova
  • K. V. Bychkov
Article

With the hydrogen atom as an example, the effect of photospheric thermal radiation on the upper layers of stellar atmospheres is studied. It is shown that when the radiation temperature exceeds 5000 K, the rates of stimulated processes in free-bound, bound-bound, and free-free transitions are comparable to the corresponding rates of the spontaneous processes. Photoexcitation and photoionization from excited states also play an important role.

Keywords

stimulated processes photoionization stellar atmospheres 

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References

  1. 1.
    J. C. Brown, Solar Phys. 29, 421 (1973).CrossRefADSGoogle Scholar
  2. 2.
    N. D. Kostyuk and S. B. Pikel’ner, Astron. zh. 51, 1002 (1974).ADSGoogle Scholar
  3. 3.
    V. P. Grinin and N. A. Katysheva, Izv. KrAO 62, 59 (1980).Google Scholar
  4. 4.
    V. P. Grinin and N. A. Katysheva, Izv. KrAO 62, 66 (1980).Google Scholar
  5. 5.
    M. M. Katsova, A. G. Kosovichev, and M. M. Livshits, Astrofizika 17, 285 (1981).ADSGoogle Scholar
  6. 6.
    J. C. Allred, A. F. Kowalski, and M. Carlsson, Astrophys. J. 809, 104 (2015).CrossRefADSGoogle Scholar
  7. 7.
    Yu. A. Fadeev and D. Gillet, Astron. Astrophys. 354, 349 (2000).ADSGoogle Scholar
  8. 8.
    Yu. A. Fadeev and D. Gillet, Astron. Astrophys. 420, 423 (2004).CrossRefADSGoogle Scholar
  9. 9.
    O. M. Belova, K. V. Bychkov, E. S. Marchenko, et al. Astron. Reports, 58, 650 (2014).CrossRefADSGoogle Scholar
  10. 10.
    D. Gillet and A. B. Fokin, Astron. Astrophys. 565, 423 (2014).CrossRefGoogle Scholar
  11. 11.
    L. A. Vainshtein, I. I. Sobel’man, and E. A. Yukov, Excitation Cross Sections of Atoms and Atomic Ions [in Russian], Nauka, Moscow (1973).Google Scholar
  12. 12.
    C. Cowley, Theory of Stellar Spectra [Russian translation], Mir, Moscow (1974).Google Scholar
  13. 13.
    O. M.Belova and K. V. Bychkov, Astrophysics, 60, 111 (2017).CrossRefADSGoogle Scholar
  14. 14.
    K. V. Bychkov and E. S. Morchenko, Vestnik MGU. Seriya 3, Fizika, Astronomiya 89 (2011).Google Scholar
  15. 15.
    L. C. Johnson, Astrophys. J. 174, 227 (1972).CrossRefADSGoogle Scholar

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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 Astrophysical InstituteM. V. Lomonosov Moscow State UniversityMoscowRussia

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