Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...134..123r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 134, no. 1, May 1984, p. 123-128.
Astronomy and Astrophysics
Astrophysics
9
Neutron Stars, Stellar Mass Accretion, Stellar Models, Stellar Radiation, X Ray Sources, Bursts, Thermonuclear Reactions
Scientific paper
The mechanisms of red-giant shell-flash emission and neutron-star X-ray bursts are investigated theoretically, extending the two-zone model of Barranco et al. (1980) by means of a third time-dependent nonlinear equation to account for the accretion process. The physical assumptions are explained, the equations are derived, and the results of numerical integration are presented graphically for a set of standard input parameters and several variants. Two types of limit-cycle oscillations are identified: thermal oscillations arising from nuclear burning in a thin shell of red giants (leading to shell flashes) and oscillations driven by both nuclear burning and mass accretion in the high-density thermonuclear-ignition region at the surface of neutron stars (leading to X-ray bursts). The two-zone model is shown to account for such burster properties as high-accretion rate stabilization, core heat-exchange effects, and double-peaked bursts.
Livio Mario
Regev Oded
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