On the theory of type 1 X-ray bursts: The energetics of bursts and the nuclear fuel reservoir in the envelope

Details On the theory of type 1 X-ray bursts: The energetics of bursts and the nuclear fuel reservoir in the envelope On the theory of type 1 X-ray bursts: The energetics of bursts and the nuclear fuel reservoir in the envelope

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8719344f&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Radio Bursts, Stellar Envelopes, Stellar Models, Thermonuclear Explosions, X Ray Sources, Nuclear Astrophysics, Stellar Mass Accretion, Stellar Physics, Stellar Radiation

Scientific paper

The observed properties of type 1 X-ray bursts from 4U/MXB 1636-53 and those of models of thermonuclear flashes on accreting neutron stars are compared. Ways to explain variations in the burst recurrence properties without an apparent correlation with the accretion rate, including the rapid succession of bursts at intervals 10 min are discussed. The strongest X-ray bursts, which occur after a very long interval, are well described by thermonuclear flash models with simple accumulation of accreted fuel, and a spherically symmetric structure in the burning shell. The majority of observed bursts, however, occur after much shorter intervals, and radiate much smaller amounts of energy, by a factor of up to 10 times that predicted by the spherical models. An ignition mechanism of the bursts is proposed in terms of elemental mixing and dissipative heating associated with hydrodynamical instabilities in the neutron star envelope caused by angular momentum carried inward by accreted gas.

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