Advertisement

Astrophysics

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

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

Article
  • 1 Downloads

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 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    J. C. Brown, Solar Phys. 29, 421 (1973).CrossRefGoogle Scholar
  2. 2.
    N. D. Kostyuk and S. B. Pikel’ner, Astron. zh. 51, 1002 (1974).Google 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).Google Scholar
  6. 6.
    J. C. Allred, A. F. Kowalski, and M. Carlsson, Astrophys. J. 809, 104 (2015).CrossRefGoogle Scholar
  7. 7.
    Yu. A. Fadeev and D. Gillet, Astron. Astrophys. 354, 349 (2000).Google Scholar
  8. 8.
    Yu. A. Fadeev and D. Gillet, Astron. Astrophys. 420, 423 (2004).CrossRefGoogle Scholar
  9. 9.
    O. M. Belova, K. V. Bychkov, E. S. Marchenko, et al. Astron. Reports, 58, 650 (2014).CrossRefGoogle 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).CrossRefGoogle 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).CrossRefGoogle Scholar

Copyright information

© 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

Personalised recommendations