Physics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.284..246k&link_type=abstract
Nature, vol. 284, Mar. 20, 1980, p. 246-248.
Physics
3
Binary Stars, Neutron Stars, Pulsars, Relativistic Effects, Gravitational Effects, Gravitational Waves, Relativistic Plasmas, Stellar Evolution, Stellar Models
Scientific paper
It is proposed that the star-like optical source reported in the vicinity of the binary pulsar PSR 1913+16 is in fact a region of confined extremely relativistic plasma glowing in the infrared, the pulsar sphere. It is shown that the relativistic wind of the binary pulsar will eventually be confined by typical interstellar matter, encountering an inner shock at a distance where the wind pressure meets the cavity pressure. The extremely relativistic electrons traversing the cavity would then emit synchrotron radiation over a distance corresponding to less than 2.8 arcsec from a distance of approximately 5 kpc, in agreement with observations of the unresolved size of the reported star in the deep red. The probable evolution of the system from a neutron star in close orbit around a He star is discussed, and it is argued that a close presupernova orbit is likely to imply a small magnetic dipole moment of the resulting neutron star, and may thus be the only exceptional property of the binary pulsar. It is also suggested that Cas A, which corresponds to a light supernova shell with a high space velocity, may turn out to be a weak binary pulsar.
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