Physics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..811h&link_type=abstract
Nature, Volume 292, Issue 5826, pp. 811-814 (1981).
Physics
6
Scientific paper
Theoretical arguments about the progenitors of pulsars suggest that all neutron stars may have essentially the same mass1,2 m and the same magnetic moment3,4 M. Direct determinations5,6 support this view and give m ~= 1033.5g (the Chandrasekhar mass) and M ~= 1030.5 G cm3 and theoretically inferred values for accreting binary systems7,1 show a surprisingly small scatter. Can this apparent uniformity of binary pulsars be reconciled with the timing data for (single) radio pulsars, many of which may have also been binaries for some time? In most theories it is assumed that the neutron star is slowed-down by the combined action of a plasma-current torque and a vacuum-wave torque. This has led to the conclusion that there is a deficiency in `old' pulsars (as measured by their `Slow-down age' P/Ṗ) and that the inferred magnetic moments vary by two orders of magnitude. A worse result is the derived pulsar birth rate2 of one per 10 yr if the half life of a pulsar is 106 yr as follows from the standard slow-down theory. From these facts we present a new model for pulsar slow-down. The present model predicts four different slow-down epochs from evolutionary changes of the magneto-sphere, which are dominated by different braking mechanisms. The model assumes that the masses, magnetic moments and initial rotation periods of all neutron stars are equal. We show that no direct relationship can exist between the `slow-down age' and the true age of a pulsar and that the pulsar birth rate is one per 100 yr.
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