On the second derivatives of periods and braking indices in radio pulsars

Abstract

The analysis of some braking mechanisms for neutron stars was carried out to determine the sign of the second derivative of the pulsar period. This quantity is the important parameter for calculations of the braking index n. It is shown that this derivative can be positive and lead to decreasing of n. It is necessary to correct the methods of calculations of n used this moment because they are based as a rule on the suggestion on the constancy of pulsar parameters (magnetic fields, angles between some axes and so on). The estimations of corrections to braking indices are obtained. It is shown that these corrections can be marked for pulsars with long periods and their small derivatives.

9 pages, 1 table

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Cited by in corpus (4)

• The Dipole Magnetic Field and Spin-down Evolutions of The High Braking Index Pulsar PSR J1640-4631
• High precision pulsar timing and spin frequency second derivatives
• Refinement of the timing-based estimator of pulsar magnetic fields
• On the pulsar spin frequency derivatives and the glitch activity