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

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

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..902f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. 902-915. Research supported by the John Simon Guggen

Astronomy and Astrophysics

Astrophysics

69

Neutron Stars, Nuclear Reactions, Stellar Envelopes, Stellar Mass Accretion, Stellar Models, X Ray Spectra, Abundance, Dwarf Stars, Exosat Satellite, Light Curve, Nuclear Astrophysics

Scientific paper

A comparison is made between the observed properties of type I X-ray bursts from 4U/MXB 1636-53 and those of models of thermonuclear flashes on accreting neutron stars. Possible explanations of variations in the burst recurrence properties without an apparent correlation with accretion rate are discussed. The strongest bursts with photospheric expansion are described well by current spherically symmetric models. The observed weak bursts suggest a mechanism that can promote the inward propagation and heating of accreted fuel so as to give rise to thermonuclear runaways much earlier than expected from spherical models. A sufficient amount of fuel to feed the weak bursts can be stored in the outer layers for neutron stars with radii greater than 8 km. The proposed mechanism and fuel storage can resolve the longstanding problem of bursts in rapid succession with intervals shorter than about 10 minutes. The proposed model explains the variation of burst peak fluxes observed from 4U/MSB 1636-53.

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