Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..56..129k&link_type=abstract
Astrophysics and Space Science, vol. 56, no. 1, June 1978, p. 129-190.
Astronomy and Astrophysics
Astronomy
6
Black Holes (Astronomy), Electrodynamics, Electromagnetic Wave Transmission, Neutron Stars, Schwarzschild Metric, Emissivity, Plane Waves, Power Series, Pulsars, Stellar Magnetic Fields, Tables (Data)
Scientific paper
Electromagnetic perturbations of the exterior Schwarzschild metric are investigated. Power-series solutions for the radial dependence of the electromagnetic field in the strong gravitational field exterior to a nonrotating black hole or neutron star are used to solve a problem concerning the scattering of a linearly polarized electromagnetic plane wave from a Schwarzschild black hole as well as the problem of a radially vibrating spherical neutron star with a frozen-in magnetic field. Expressions for the total elastic scattering and absorption cross sections are obtained for the black-hole problem. The radiation induced by neutron-star vibrations is determined, and it is found that general-relativistic effects on the radiated power can be very important for typical neutron-star parameters. Specifically, it is shown that the star is hyperemissive (i.e., the power radiated is in excess of the flat-space result) for all values of frequency above a certain limit, that the radiation is hyperemissive for all frequencies in the dipole case, and that the radiation is hypoemissive below a fixed frequency for higher multipoles.
Cohen Jeffery M.
Kearney Michael Wesley
Kegeles Lawrence Steven
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