Physics – Optics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..277l&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 277-281. Research supported by the National Research Council of Cana
Physics
Optics
7
Black Holes (Astronomy), Optical Properties, Relativity, Astrophysics, Geometrical Optics, Gravitational Collapse, Optical Thickness, Red Shift, Schwarzschild Metric, Stellar Magnitude
Scientific paper
The detailed optical properties of an optically thick nonrotating, spherically symmetric star, including 'backward-emitted light', are examined within the framework of geometrical optics. It is shown that for geodesic collapse the redshift across the apparent disk of the collapsing star is minimal, and a constant (in time) at the apparent limb. Moreover, the observed intensity is peaked near the apparent limb and can be dominated by 'backward-emitted light'. The known results of most astrophysical significance, that the order of magnitude of the e-folding time for the decay of the observed flux is given by the reciprocal of the surface gravity of the resultant black hole, remains unaltered by the inclusion of 'backward-emitted light'.
Lake Kayll
Roeder Robert C.
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