Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270..211l&link_type=abstract
Nature, vol. 270, Nov. 17, 1977, p. 211-216.
Astronomy and Astrophysics
Astrophysics
59
Gamma Ray Astronomy, Neutron Stars, Stellar Mass Accretion, X Ray Sources, Astrophysics, Bursts, Stellar Models, X Ray Spectra
Scientific paper
Observational data are reviewed for the more than 30 X-ray burst sources that have been discovered in the past two years. Attention is given to the galactic distribution of the burst sources, burst fluxes and recurrence, burst profiles, burst spectra, steady emission from the burst sources, the spectra and character of associated steady sources, and optical identifications. It is noted that the burst sources are spread along the galactic equator and are probably all located within about 30 deg of the galactic center, that the recurrence of bursts is sometimes regular though not strictly periodic, that significant spectral changes occur during bursts, and that burst sources commonly emit a persistent but variable X-ray flux. Some unusual properties of the rapid burster MXB 1730-335 are described, and differences between X-ray and gamma-ray bursts are summarized. Theoretical models of the X-ray burst sources are discussed which involve instabilities in the accretion of matter onto a compact object or thermonuclear flashes in matter accreted onto the surface of a neutron star.
Joss Paul C.
Lewin Walter H. G.
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