Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..602k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 602-621. Research supported by NFR.
Astronomy and Astrophysics
Astrophysics
60
Gamma Rays, Stellar Composition, Stellar Cores, Supernova 1987A, Supernovae, Thermalization (Energy Absorption), Chemical Composition, Electron Energy, Gas Ionization, Gravitational Collapse
Scientific paper
The Spencer-Fano equation is used to calculate the gamma-ray deposition in supernovae. Ionization, excitation, and heating rates are presented for different chemical composition zones of a core collapse supernova, as well as for a solar composition applicable to, for example, AGN. The thermalization in pure helium, oxygen, and iron plasmas is discussed. Convenient analytical expressions are given to facilitate the use of these results for calculating the physical conditions and emission from supernovae. The spectral characteristics of the emission following nonthermal excitation and ionization in the supernova are discussed. The results are applied to the ionization of hydrogen and the formation of the H-alpha line. Absorption of UV photons in the Balmer continuum is found to dominate the excitation before about 500 d, while direct nonthermal excitation from the ground state dominates thereafter. The way in which the wing of the H-alpha line can be used as a probe of the density in the envelope is also discussed.
Fransson Claes
Kozma Cecilia
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