Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-06
Astronomy and Astrophysics
Astrophysics
11 pages (including 5 figures), proceedings of the "Hydrogen Deficient Stars" meeting in Tubingen
Scientific paper
We review the current state of the art in double degenerate merger simulations to better understand the role this phenomenon plays in type Ia progenitors. Because the fate of a merged system may well depend on the exact evolution of the matter temperature (as well as mixing of the merged system), precision simulations are required to determine the true fate of these systems. Unfortunately, if we compare the results of current simulations, we find many-order of magnitude differences in quantities like mass-transfer rates in the merger process. We discuss these differences and outline an approach using verification and validation that should allow us to achieve a level of precision sufficient to determine the true fate (thermonuclear vs. collapse) of double degenerate mergers. Understanding the fate of lower-mass systems (e.g. R Coronae Borealis stars) may be key in our final testing phase.
Diehl Steven
Fryer Chris L.
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