Thermonuclear model for high energy transients

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Deposition, Gamma Ray Bursts, High Energy Interactions, Thermonuclear Reactions, Transient Reactor Test Facility, X Ray Sources, Dynamic Models, Eddington Approximation, Radiant Flux Density, Steady State, Transient Oscillations

Scientific paper

The thermonuclear model for X- and gamma-ray bursts is discussed. Different regimes of nuclear burning are reviewed, each appropriate to a given range of accretion rate. Modifications introduced by radiatively driven mass loss, the thermal inertia of the envelope, different burning mechanisms, and two dimensional considerations and difficulties encountered when the thermonuclear model is confronted with observations of rapidly recurrent bursts and super Eddington luminosities and temperatures are discussed. Results from a numerical simulation of a combined hydrogen helium runaway initiated at pycnonuclear density are presented. The thermonuclear model for gamma-ray bursts is also reviewed and updated. Gamma-ray bursts of various types appear possible for a very broad variety of accretion rates. The thermonuclear model appears capable of yielding a great diversity of high energy transient phenomena for various accretion rates, magnetic field configurations, and neutron star envelope histories.

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