Interpretation of the maximum light spectrum of a Type I supernova

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Stellar Models, Stellar Spectra, Supernovae, Visual Photometry, Absorption Spectra, Calcium, Magnesium, Oxygen Ions, Photosphere, Resonance Scattering, Silicon, Sulfur

Scientific paper

A synthetic spectrum consisting of Ca II, Si II, S II, Mg II and O II resonance scattering lines superposed on a continuum represents a high-quality optical spectrum of the 1981 Type I supernova in NGC 4538 at maximum light. Together with a photospheres LTE assumption which leads to Ca, Si, S, Mg and O relative abundances consistent with solar ones over a range of continuum temperatures, the spectrum is inconsistent with such models as that of double-detonation, in which material with a velocity of 12,000-15,000 km/sec is completely burned to Ni-56.

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