6.
We present a model of a gamma-ray burst (GRB) related to “very massive” stars. In the framework of our model, the GRB phenomenon
is a result of helium burning in degenerate conditions in a massive star (≳130
M
⊙), in which the thermal nuclear burning occurs in the deflagration regime and has a pulsating temporal pattern. The shock
runs away from the burning (reaction) zone, which leads to the development of a coronal outflow (jet-like) structure. In our
scenario the GRB observable prompt fast rise and decay part can be a result of photon propagation through the hot corona (Comptonization
photosphere) of the star. On the other hand, the GRB afterglow is a cooling phase of the expanding and outflowing envelope.
Presumably, the X-ray part of the GRB emergent spectrum is formed due to upscattering of soft photons of outer layers of the
star off hot coronal electrons, and thus it should have a specific shape of the Comptonization spectrum.
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