Computer Science
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aipc..115..273w&link_type=abstract
AIP Conference Proceedings, Volume 115, pp. 273-297 (1984).
Computer Science
40
X-Ray Sources, X-Ray Bursts, Neutron Stars, Radiation Mechanisms, Polarization
Scientific paper
The thermonuclear activity accompanying the accretion of hydrogen-rich material onto the (spherically symmetric) surface of a neutron star is numerically simulated. Several different values of (constant) accretion rate and metallicity are employed and models are propagated through multiple episodes of bursting activity. In one case, 12 consecutive x-ray bursts are modelled and the energy transport into the stellar core determined. Erratic bursting activity is exhibited by systems having relatively low values of accretion rate and metallicity. In extreme cases, hydrogen ignition may be forestalled until the density required for electron capture on free protons (ρ~1.5×107 g cm-3 for solar hydrogen abundance) is attained. The observational consequence of such an extreme case is a rapid x-ray transient. A new mode of instability is reported that may be related to ``rapidly recurrent'' x-ray bursters. Possible mechanisms for the production of rapid x-ray transients with ``precursors'' are also briefly discussed.
Weaver Thomas A.
Woosley Stan E.
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