Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....80l...7k&link_type=abstract
Astronomy and Astrophysics, vol. 80, no. 2, Dec. 1979, p. L7-L10.
Astronomy and Astrophysics
Astrophysics
15
Binary Stars, Neutron Stars, Stellar Mass Accretion, Stellar Structure, X Ray Sources, Disks (Shapes), Light Curve, Luminous Intensity, Polarization Characteristics, X Ray Stars
Scientific paper
The secondary in the X-ray binary Cyg X-1 is interpreted as an accreting neutron star surrounded by a many solar mass disk. The disk has a granular structure but is non-linearly stable. Its lifetime is controlled by dissipative angular momentum transport towards and through the inner Lagrangean point. Its reradiation of the primary's radiation input may explain the peculiar time-varying light curve of the system, both in intensity and polarization. Transitions to the high state occur when the neutron star exceeds a critical spin frequency, of order 1 Hz, which controls accretion. X-ray-bursting is caused by the interaction of the corotating magnetosphere with the inner edge of the disk.
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