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Trends in Pulsar Research (Hardcover)
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Trends in Pulsar Research (Hardcover)
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Pulsars are stars, a significant part of whose observed energy
output is not continuous but is emitted as distinct flashes or
pulses of electromagnetic radiation. Many pulsars also emit some
radiation weakly and constantly, forming a background for the more
intensive pulses. Three distinct classes of pulsars are presently
known to astronomers, according to the source of energy that powers
the radiation: Rotation-powered pulsars, where the loss of
rotational energy of the star powers the radiation X-ray pulsars,
where the gravitational potential energy of accreted matter is the
energy source, and Magnetars, where the decay of an extremely
strong magnetic field powers the radiation. Although all three
classes of objects are neutron stars, their observable behaviour
and the underlying physics are quite different. There are, however,
connections. For example, X-ray pulsars are probably old
rotation-powered pulsars that have already lost most of their
energy, and have only become visible again after their binary
companions expanded and began transferring matter on to the neutron
star. The process of accretion can in turn transfer enough angular
momentum to the neutron star to "recycle" it as a rotation-powered
millisecond pulsar.
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