Successive X-ray bursts from accreting neutron stars
1993; IOP Publishing; Volume: 413; Linguagem: Inglês
10.1086/173000
ISSN1538-4357
AutoresRonald E. Taam, S. E. Woosley, T. A. Weaver, D. Q. Lamb,
Tópico(s)High-pressure geophysics and materials
Resumoview Abstract Citations (89) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Successive X-Ray Bursts from Accreting Neutron Stars Taam, Ronald E. ; Woosley, S. E. ; Weaver, T. A. ; Lamb, D. Q. Abstract The evolution of a neutron star undergoing a series of thermonuclear flashes in its accreted hydrogen-rich layer has been numerically followed to determine the effects of the history of the neutron star's thermal and compositional structure on the properties of the emitted X-ray bursts. Burst characteristics are studied for a range of mass accretion rates, CNO abundances in the accreted matter, and initial thermal states of the underlying neutron star core; the bursts exhibit erratic behavior for low CNO metal abundances and cool neutron star cores, with the burst recurrence time scales varying by 1-2 orders of magnitude. There is typically a continued presence of a substantial amount of unburnt hydrogen in the accreted layer throughout the series of the X-ray burst events. Convective mixing during the quiescent phase leads to the inward transport of helium to high densities and eventually to the initiation of the next outburst. The resulting bursts can be weak and, in such cases, are characterized by short recurrence time scales (1-2 hr), low peak luminosities (0.1-0.2 times the Eddington value), and low alpha-values (about 20). Publication: The Astrophysical Journal Pub Date: August 1993 DOI: 10.1086/173000 Bibcode: 1993ApJ...413..324T Keywords: Brightness Distribution; Neutron Stars; Nuclear Fusion; Stellar Mass Accretion; X Ray Astronomy; Accretion Disks; Bursts; Stellar Composition; Astrophysics; ACCRETION; ACCRETION DISKS; STARS: NEUTRON; X-RAYS: BURSTS full text sources ADS | data products SIMBAD (3)
Referência(s)