Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvl..95z1101g&link_type=abstract
Physical Review Letters, vol. 95, Issue 26, id. 261101
Physics
1
Wave Generation And Sources, Neutron Stars, Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
There are four puzzles on 1E 1207.4-5209: (1) The characteristic age of the pulsar is much higher than the estimated age of the supernova remnant; (2) the magnetic field inferred from spin down is significantly different from the value obtained from the cyclotron absorption lines; (3) the spinning down of the pulsar is nonmonotonic; (4) the magnitude of the frequency's first derivative varies significantly and its sign is also variable. The third puzzle can be explained by a wide binary system, with orbital period from 0.2 to 6 yr. This Letter proposes that all four puzzles can be explained naturally by an ultracompact binary with an orbital period between 0.5 and 3.3 min. With the shortest orbital period and a close distance of 2 kpc, the characteristic amplitude of gravitational waves is h˜3×10-21. It would be an excellent source for gravitational-wave detectors such as the Laser Interferometer Space Antenna.
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