Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-30
Astron.Astrophys.376:543,2001
Astronomy and Astrophysics
Astrophysics
A&A in press, 10 pages, 9 figures, extended discussion of the braking index
Scientific paper
10.1051/0004-6361:20010988
We investigate the evolution of pulsars in the (P,P-dot) diagram. We first present analytical formulae to follow the evolution of a pulsar using simple exponential models for magnetic field decay and alignment. We then compare these evolutionary tracks with detailed model calculations using ohmic decay of crustal neutron star magnetic fields. We find that, after an initial phase with a small braking index, n, pulsars evolve with enhanced torque decay (n >> 3) for about 1 Myr. The long term evolution depends on the impurity parameter of the crust. If impurities are negligible in older isolated pulsars we expect their true age to be approximately equal to their observed characteristic age, tau = P/(2*P-dot). It is not possible from data to constrain model parameters of the neutron star crust.
Konar Sushan
Tauris Thomas M.
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