Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..623v&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
18
Binary Stars, Neutron Stars, Stellar Evolution, X Ray Binaries, X Ray Sources, Galactic Bulge, Galactic Radiation, Globular Clusters, Orbits, Pulsars, Stellar Mass Accretion, White Dwarf Stars
Scientific paper
Observational evidence suggests that most - if not all - binary X-ray sources are neutron stars. The evolutionary status and possible formation mechanisms of type I (massive) and type II (low-mass) X-ray binaries are discussed. The difference between the standard massive X-ray binaries and the Be/X-ray binaries is ascribed to a somewhat different evolutionary history and status, and possible reasons for the existence of short- and long-period X-ray pulsars are discussed. Type II X-ray sources in globular clusters were most probably formed by capture processes; their formation rate inferred from the observations indicates that only a small fraction (less than about 1 to 10%) of the originally formed neutron stars have remained in their clusters. Type II sources in the galactic bulge may also have formed from cataclysmic binaries in which a white dwarf was driven over the Chandrasekhar limit by accretion.
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