Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e..27a&link_type=abstract
On the Present and Future of Pulsar Astronomy, 26th meeting of the IAU, Joint Discussion 2, 16-17 August, 2006, Prague, Czech Re
Astronomy and Astrophysics
Astronomy
Scientific paper
We offered the test for checking the applicability of fall-back or propeller models for the pulsar evolution. This test based on the comparison of the pulsars' ages predicted by these models with the real kinematical ages of pulsars. With this goal two groups of pulsars, namely relatively young and old pulsars with the distances from the galactic plane ;< Z > < 100 pc and < Z > >300 pc, respectively, were selected. At the same time, the irregular character of deviation of the pulsars' birthplaces from the geometrical plane of the Galaxy has been taken into account. The distribution of these groups of pulsars in Period-Period derivative diagram is compared with the theoretical tracks of the evolution of the pulsars predicted by fall-back and combined dipole + propeller models at various values of the initial parameters of radio pulsars (magnetic field and accretion rate of matter). As it is well known, characteristic feature of combined model (unlike to the pure magneto-dipole) is the increase of period derivative up to some critical value with increase of the period of pulsars, i.e. the age of pulsars. It is shown that the distribution of selected pulsars in the mentioned diagram contradicts to this model and can be easily explained by standard model of pulsar evolution.
Allakhverdiev A.
Kasumov F.
Tagieva Sevinc
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