Investigations of Pointwise Ignition of Helium Deflagrations on Neutron Stars

Details Investigations of Pointwise Ignition of Helium Deflagrations on Neutron Stars Investigations of Pointwise Ignition of Helium Deflagrations on Neutron Stars

2002-11-14

arxiv.org/abs/astro-ph/0211336v1

Astronomy and Astrophysics

Astrophysics

7 pages, to appear in the Proceedings of the 3D Stellar Evolution Workshop, Livermore, CA, July 2002

Scientific paper

We look at the spreading of localized temperature perturbations in the accreted fuel layer of a non-rotating neutron star. The pressure at the base of the accreted fuel layer is large and the material is only partially degenerate. Any temperature perturbations and resulting pressure gradients will lead to enormous accelerations (both laterally and vertically) of the material in the fuel layer. If the burning of this fuel cannot proceed more rapidly than the spreading of this perturbation, then localized burning cannot take place, and it is likely that the ignition would have to proceed simultaneously throughout the envelope. We present some multidimensional simulations of the spreading of temperature perturbations in a helium atmosphere on a neutron star.

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