Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ans..conf..216f&link_type=abstract
In Max-Planck Inst. Phys. and Astrophys. Accreting Neutron Stars p 216-218 (SEE N83-15179 05-88)
Astronomy and Astrophysics
Astrophysics
Astrophysics, Gamma Ray Bursts, Neutron Stars, Stellar Models, Time, X Rays, Deflagration, Detonation Waves, Nuclear Reactions, Stellar Magnetic Fields, Stellar Mass Accretion
Scientific paper
Models of neutron star processes to account for observed X-ray and gamma ray burst phenomena are examined. If a sufficiently dense layer of matter is accreted onto the surface of a neutron star, a nuclear runaway can occur at the base of the layer. As a result of the extreme temperature sensitivity of the nuclear reactions, such a runaway will initiate at a single point instead of simultaneously over the entire layer and then propagate around the star as a burning front, igniting the remainder of the accreted fuel. The time required for this front to propagate across the surface can have observational consequences. Depending on the relationhip between this timescale and the time for the emission of energy from the hot matter behind the front, the propagation time can correspond to either the rise time or the duration of the event. Two different types of burning fronts (deflagration or detonation fronts) can be obtained depending on the amount of matter which accumulates before the runaway occurs.
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