Implications of a Constant Observed Braking Index for Young Pulsars' Spin-down

Details Implications of a Constant Observed Braking Index for Young Pulsars' Spin-down Implications of a Constant Observed Braking Index for Young Pulsars' Spin-down

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488..409a&link_type=abstract

Astrophysical Journal v.488, p.409

Astronomy and Astrophysics

Astronomy

10

Stars: Pulsars: General, Stars: Pulsars: Individual Alphanumeric: Psr 0531+21, Stars: Pulsars: Individual Alphanumeric: Psr B0540-, 9, Stars: Pulsars: Individual Alphanumeric: Psr B0833-, 5, Stars: Pulsars: Individual Alphanumeric: Psr B1509-, 8

Scientific paper

The observed braking index nobs, which has been determined for a few young pulsars, has been found to differ from the expected value for a rotating magnetic dipole model. In addition, the observed jerk parameter, determined for two of these pulsars, disagrees with the theoretical prediction mobs = 15 in both cases. We propose a simple model able to account for these differences, based on a growth of the "torque function" K=- Omega dot / Omega n , under the constraint that nobs is a constant. We show that there is observational evidence supporting the latter hypothesis and derive initial values for several physical quantities for the four pulsars whose nobs has been measured.

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