Effect of Photospheric Radiation on the Upper Layers of a Star’s Atmosphere
- 10 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.
Keywordsstimulated processes photoionization stellar atmospheres
Unable to display preview. Download preview PDF.
- 3.V. P. Grinin and N. A. Katysheva, Izv. KrAO 62, 59 (1980).Google Scholar
- 4.V. P. Grinin and N. A. Katysheva, Izv. KrAO 62, 66 (1980).Google Scholar
- 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.C. Cowley, Theory of Stellar Spectra [Russian translation], Mir, Moscow (1974).Google Scholar
- 14.K. V. Bychkov and E. S. Morchenko, Vestnik MGU. Seriya 3, Fizika, Astronomiya 89 (2011).Google Scholar