On the light curve of an orbiting SPOT

Details On the light curve of an orbiting SPOT On the light curve of an orbiting SPOT

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..531k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 531-533.

Astronomy and Astrophysics

Astronomy

17

Accretion Disks, Black Holes (Astronomy), Eclipses, Light Curve, X Ray Sources, Active Galactic Nuclei, Gravitational Lenses, Relativistic Effects, Space-Time Functions

Scientific paper

We investigate the influence of eclipses due to the thickness of an accretion disc on the light curve of an X-ray emitting spot located on the disc surface. The disc is assumed to orbit a compact object which is described by the Kerr metric. General relativistic effects affecting photon paths and energy are treated within the framework of geometrical optics. We find that the eclipse curve on the disc surface has a 'cusp' which is caused by gravitational lensing. We give an example of the light curve, which is significantly narrower compared to the case with no eclipse.

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