Geometrical effects in off-center detonation of helium shells

Details Geometrical effects in off-center detonation of helium shells Geometrical effects in off-center detonation of helium shells

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..244l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 244-250.

Astronomy and Astrophysics

Astrophysics

30

B Stars, Detonation, Geometry, Supernovae, White Dwarf Stars, Carbon Stars, Oxygen, Stellar Interiors, Stellar Models

Scientific paper

The penetration of detonation waves from helium shells into C-O cores of accreting white dwarfs is studied. One-dimensional calculations using a Riemann solver show that for the spherically symmetric case the most relevant parameter for the formation of a double detonation is the location of the ignition surface. As long as ignition occurs at the interface, double detonation does not exist regardless of the accretion rates and the C-O core mass. A two-dimensional analysis, which resolves the interaction between a sliding Chapman-Jouguet front and adjacent medium, shows that the carbon near the interface is heated by the shock only slightly above 10 to the 9th K. Hence, some portion of the C-O core will burn and double detonation cannot be excluded. However, since rarefaction effects are not included in the analysis, detonation may not occur.

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