Electromagnetic damping of neutron star oscillations
Nonradial pulsations of a neutron star with a strong dipole magnetic field cause emission of electromagnetic radiation. Here we compute the power radiated to vacuum by neutron star g-mode pulsations and by torsional oscillations of the neutron star crust. For the low-order quadrupole fluid g-modes we have considered, we find electromagnetic damping to be considerably more effective than gravitational radiation. For example, a 0.5 M/sub sun/ neutron star with a core temperature approx.10/sup 7/ K has a g/sub 1/-mode period of 371 ms; for this mode were find the electromagnetic damping time to be tau/sub FM/approx.0.3 s, assuming the surface magnetic field strength of the neutron star to be B/sub 0/approx.10/sup 12/ gauss. This is considerably less than the corresponding gravitational radiation time tau/sub GR/approx.3 x 10/sup 17/ yr. For dipole g-mode oscillations, there is no gravitational radiation, but electromagnetic damping and ohmic dissipation are efficient damping mechanisms. For dipole torsional oscillations, we find that electromagnetic damping again dominates, with tau/sub EM/approx.5 yr. Among the cases we have studied, quadrupole torsional oscillations appear to be dominated by gravitational radiation damping, with tau/sub GR/approx.10/sup 4/ yr, as compared with tau/sub EM/approx.2 x 10/sup 7/ yr.
- Research Organization:
- Department of Physics and Astronomy and C. E. Kenneth Mees Observatory, University of Rochester
- OSTI ID:
- 6468869
- Journal Information:
- Astrophys. J.; (United States), Vol. 281:2
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
NEUTRON STARS
OSCILLATIONS
DAMPING
ELECTROMAGNETIC RADIATION
ENERGY LOSSES
GRAVITATIONAL RADIATION
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MAGNETIC STARS
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PULSARS
STELLAR RADIATION
COSMIC RADIO SOURCES
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HEATING
LOSSES
PLASMA HEATING
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640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
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