Astronomy and Astrophysics – Astronomy
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..621f&link_type=abstract
Astronomical Journal, vol. 84, May 1979, p. 621-626.
Astronomy and Astrophysics
Astronomy
7
Pulsars, Stellar Evolution, Stellar Models, Neutron Stars, Relativistic Effects, Star Distribution, Stellar Magnetic Fields
Scientific paper
Two models of evolution for pulsars are investigated. It is found that a model assuming the same initial magnetic moment but different time scales for its decay for different pulsars fails to reproduce the densities of pulsars in the log (period derivative) vs log (period) diagram. A model assuming different initial magnetic moments but the same decay time for all pulsars can reproduce the observed densities for high-period-derivative pulsars with the exception of a region of apparently anomalous low density (a 'gap' in period derivative). Assuming that the gap is a statistical fluctuation, the model is used to derive the pulsar birthrate in the galaxy. The birthrate is found to be highly dependent on the pulsar beaming model assumed, but is greater than 1 pulsar/77 yr in the most conservative case and less than 1 pulsar/8 yr in the least conservative case.
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