Breaking index and the evolution of PSR B0950+08
Huang, Haitao
We test different models of rotational evolution and thermal evolution for PSR B0950+08,which with characteristic age and kinematic age about 17.4 Myr and 1.9^{+5.5}_{-0.6} Myr,respectively.From the observation of Nan Shan Radio Telescope in about 10 years,where the distribution of its brake index shows a quasi-period oscillation.The simulations shows that the magnetic field decay model with exponential form present the true age of B0950+08 is close to its kinematic age,and the obliquity angle evolve between rotational and magnetic axes present its true age close to the characteristic age.But there is only magnetic field evolution model of long-term decay modulated by short-term oscillation can account for the distribution of brake index. The thermal emission of B0950+08 present its surface temperature range is about(1-3)\times10^5 K.We had simulated the thermal evolution with chemical heating and vortex creep heating,the results shows that the latter coupling with magnetic field decay can account for the surface temperature of B0950+08,the former can not get the surface temperature of B0950+08 unless it coupling with magnetic obliquity angle evolve and the initial rotation period satisfy P0\leq10ms.