Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.280..375v&link_type=abstract
Nature, vol. 280, Aug. 2, 1979, p. 375-377.
Astronomy and Astrophysics
Astronomy
39
Galactic Bulge, Galactic Radiation, X Ray Sources, Astronomical Models, Bursts, Galactic Structure, Luminosity, Neutron Stars, Sas-3, Spaceborne Astronomy, Stellar Mass Accretion, X Ray Astronomy
Scientific paper
Intrinsic persistent emission from galactic bulge X-ray sources and the ratio of the average persistent X-ray luminosity to the time-averaged burst luminosity associated with Type I burst sources are discussed in the light of the thermonuclear flash model of X-ray burst emission. Values of the ratio between average persistent luminosity and time-averaged burst luminosity for a large collection of SAS 3 sources are presented to confirm the predictions of the burst model of thermonuclear flashes in freshly accreted matter on a neutron star. The model also predicts a critical value of the persistent accretion rate, below which bursts can occur. It is suggested that the galactic bulge X-ray sources represent neutron stars undergoing accretion, with burst sources accounting for a subset in which the accretion rate is below the critical value.
Cominsky Lynn
Joss Paul C.
Lewin Walter H. G.
Paradijs Jan van
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