Geometrical Effects in Off-Center Detonation of Helium Shells
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1990
- DOI:
- 10.1086/169189
- Bibcode:
- 1990ApJ...361..244L
- Keywords:
-
- B Stars;
- Detonation;
- Geometry;
- Supernovae;
- White Dwarf Stars;
- Carbon Stars;
- Oxygen;
- Stellar Interiors;
- Stellar Models;
- Astrophysics;
- STARS: ACCRETION;
- STARS: BINARIES;
- STARS: INTERIORS;
- STARS: SUPERNOVAE;
- STARS: WHITE DWARFS