Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pazh...13..671c&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 13, Aug. 1987, p. 671-679. In Russian. In Russian. In Russian.
Astronomy and Astrophysics
Astronomy
6
Gas Ionization, Hydrogen Ions, Photoionization, Radioactive Decay, Stellar Evolution, Supernovae, Cobalt Isotopes, Ion Production Rates, Iron Isotopes, Stellar Luminosity
Scientific paper
The ionization of hydrogen in the type II supernova SN 1970g at the late stage (t ≈ 270 days) is studied assuming that the supernova luminosity is due to the radioactive decay 56Co→56Fe. The ionization balance of the hydrogen is calculated. It is shown that (a) nonthermal ionization itself is inadequate; (b) when thermal ionization being taken into account the required ionization degree is reached at Te ≈ 7000K; (c) main process of the hydrogen ionization is the photoionization from the level n = 2 by Mg II λ2798 quanta. The author predicts the intensity of the emission line of Mg II λ2798 in the late stage spectra of the SN II comparable with that of the Hα line.
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