Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phys...35..787b&link_type=abstract
(Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysics and Fusion Research, 2nd, Toledo, OH, Aug. 1986) Physica
Astronomy and Astrophysics
Astrophysics
1
Heavy Elements, Spectrum Analysis, Stellar Spectra, Supernovae, Ultraviolet Spectra, Abundance, Ejecta, Nickel Isotopes, Radioactive Decay, Stellar Envelopes, Stellar Mass Accretion
Scientific paper
The optical-ultraviolet spectrum of a classical type I supernova (type Ia) appears to be formed in a pure heavy-element plasma. During the first weeks after the explosion, the spectrum forms in the outer, high-velocity layers of the ejected material, where the composition is a mixture of intermediate-mass elements from carbon to calcium. At later times the spectrum forms in deeper, slower material consisting of a time-dependent mixture of iron and cobalt, resulting from the decay of radioactive Ni-56 that was synthesized by nuclear fusion at the time of the explosion. In a type Ia supernova, unlike other astronomical sources of radiation, hydrogen and helium are not present to dominate the atomic processes. Consequently, special atomic data needs arise.
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