Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9331073c&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Light Curve, Mathematical Models, Neutron Stars, Periodic Variations, Stellar Flares, X Ray Astronomy, Black Holes (Astronomy), Stellar Mass Accretion, X Rays
Scientific paper
NGC 6814 shows approximately 12,200s periodicity in ME x-ray light curve of the EXOSAT observation. Recently, it has been suggested that this behavior is due to the gravitational lensing of a bright spot orbiting very closely around a supermassive black hole. It is proposed that the 'bright spot' is a neutron star accreting supercritically from the disk around the central black hole. The loss of orbital angular momentum of the neutron star due to gravitational radiation is supplied by the matter accreted onto it. The parameters are: mass of the central black hole is approximately 9.2 x 106 solar mass, the mass of the neutron star orbiting at six Schwarzschild radius of the central black hole is 0.4 solar mass. The intrinsic luminosity of the supercritically accreting neutron star turns out to be approximately 6.4 x 1040 ergs/sec.
Bao Gang
Chakrabarti Sandip K.
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