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By A. M. Khokhlov


Thermonuclear explosions of Type Ia supernovae (SNIa) involve turbulent deflagrations, detonations, and possibly a deflagration-to-detonation transition. A phenomenological delayed detonation model of SNIa successfully explains many observational properties of SNIa including monochromatic light curves, spectra, brightness – decline and color – decline relations. Observed variations among SNia are explained as a result of varying nickel mass synthesised in an explosion of a Chandrasekhar mass C/O white dwarf. Based on theoretical models of SNIa, the value of the Hubble constant Ho ≃ 67km/s/Mpc was determined without the use of secondary distance indicators. The cause for the nickel mass variations in SNIa is still debated. It may be a variation of the initial C/O ratio in a supernova progenitor, rotation, or other effects. 1

Year: 1999
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