Computer Science
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.332..416w&link_type=abstract
Nature (ISSN 0028-0836), vol. 332, March 31, 1988, p. 416-418.
Computer Science
15
Accretion Disks, Neutron Stars, Pulsars, Stellar Magnetic Fields, Stellar Rotation, Angular Momentum, Field Strength, Globular Clusters, Magnetospheres
Scientific paper
The rotation period of the recently disovered 3.05 ms pulsar PSR1821-24 in the globular cluster M28 appears to violate the minimum period possible from spin-up by accretion for the inferred magnetic field strength of 2.3 x 10 to the 9th G. In addition, the inferred magnetic field strength of 5 x 10 to the 11th G of PSR1951+32, in the supernova remnant CTB80, is low when compared to the spin-down age of about 100,000 yr, suggesting perhaps that not all neutron stars are born with magnetic fields greater than 10 to the 12th G. It is pointed out here that these apparent contradictions arise because the derivation of the previously used spin-up limit does not take into account the domination of the inner accretion disk by radiation pressure. The correct relation depends on the underlying assumptions about the viscosity in the inner disk and how the accretion disk interacts with the magnetosphere.
Stella Luigi
White Nicholas E.
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