| Issue |
A&A
Volume 450, Number 1, April IV 2006
|
|
|---|---|---|
| Page(s) | L1 - L4 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:200600019 | |
| Published online | 03 April 2006 | |
Letter to the Editor
Why the braking indices of young pulsars are less than 3?
Department of Astronomy, Nanjing University, Nanjing 210093, PR China e-mail: [chenwc;lixd]@nju.edu.cn
Received:
11
October
2005
Accepted:
24
February
2006
In this letter we discuss two possible reasons which
cause the observed braking indices n of young radio pulsars to be
smaller than 3: (a) the evolving spin-down model of the magnetic
field component 
increases with time; (b) the extrinsic
braking torque model in which the tidal torques exerted on the
pulsar by the fallback disk, and carries away the spin angular
momentum from the pulsar. Based on some simple assumptions, we
derive the expression of the braking indices, and calculate the
spin-down evolutionary tracks of pulsars for different input
parameters.
Key words: pulsars: general / stars: magnetic fields / stars: rotation
© ESO, 2006
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