Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977azh....54..772b&link_type=abstract
Astronomicheskii Zhurnal, vol. 54, July-Aug. 1977, p. 772-780. In Russian.
Astronomy and Astrophysics
Astronomy
Abundance, Hydrogen, Stellar Models, Supernova Remnants, Atomic Energy Levels, Equilibrium Equations, Explosions, Photoionization, Stellar Winds
Scientific paper
By assuming LTE conditions, previous papers have concluded that the hydrogen abundance in type I supernovae (SN I) is anomalously low. The present paper confirms this conclusion by solving the equilibrium equations for a three-level hydrogen atom. It is shown that the second and third excited levels are depopulated mainly as a result of photoionization by the continuum of the supernova itself, that the observed UV 'pileup' in SN I spectra leads to an increase in the ratio between the number of atoms in the second and third levels relative to the LTE case, and that this increase should entail the appearance of hydrogen absorption lines. The absence of such lines in SN I spectra is taken as an indication of a low hydrogen abundance. A model involving stellar-wind outflow before the supernova explosion is proposed for explaining the nearly normal hydrogen abundance observed in filaments of the Crab Nebula and Tycho's Nebula.
Bychkov K. V.
Bychkova V. S.
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