Long-term cycles in cosmic X-ray sources

Details Long-term cycles in cosmic X-ray sources Long-term cycles in cosmic X-ray sources

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ssrv...45..291p&link_type=abstract

Space Science Reviews (ISSN 0038-6308), vol. 45, no. 3-4, 1987, p. 291-348.

Physics

101

Cosmic X Rays, Periodic Variations, X Ray Sources, Accretion Disks, Neutron Stars, Stellar Mass, X Ray Binaries

Scientific paper

Data on long-term cycles in galactic X-ray sources are reviewed, and classes of variations are identified including precessional activity, recurrent outbursts in Population II sources, and Be/neutron star flare cycles. Cycles of 30-300 days have been found in LMC X-4, Her X-1, SS433, and Cyg X-1 which represent cyclic variations in both the inner and outer parts of the accretion disk. Quasi-periodic cycles with periods ranging from 1/2 to 2 years have been noted in several low-mass X-ray binaries. It is suggested that periodic outbursts in the Be/neutron star systems may result from variable mass transfer in a wide eccentric orbit.

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