Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245l..25k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. L25-L28.
Astronomy and Astrophysics
Astrophysics
91
Nuclear Astrophysics, Stellar Models, Supernovae, Hydrodynamics, White Dwarf Stars
Scientific paper
The preliminary results of detailed nucleosynthesis computations are presented for delayed detonation (DD) models of Type Ia supernovae. The main parameters of the models considered are the initial density at the center, the ratio of the deflagration wave velocity and the velocity of sound ahead of the wave, and the density ahead of the deflagration wave at which the transition from a deflagration to a detonation occurs. For thermonuclear models of Type Ia supernovae, the limitations on the deflagration wave velocity near the center, Ddef is less than approximately 0.03 a(s), and on the central density of an exploding white dwarf, rho(c) is less than approximately 2-2.5 10 to the 9th g/cu cm, are obtained. It is suggested that the transition from a deflagration to a detonation in the DD models occurs due to both the turbulence in the vicinity of the flame front and the strong pulsation of the dwarf during the explosion.
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