Using a new method of multi-frequency of K parameter,we estimate the ratio of altitudes of radio emission region of pulsars at 430 and 1418 MHz.The value of the ratio is 1.34±0.12 and the power law index of altit...Using a new method of multi-frequency of K parameter,we estimate the ratio of altitudes of radio emission region of pulsars at 430 and 1418 MHz.The value of the ratio is 1.34±0.12 and the power law index of altitude-frequency is 0.24±0.08.It is indicated that the lower radio frequencies originate further out and the emission region is radially narrow.展开更多
According to the observational limits on the radius and mass,the fastest rotating pulsar(PSR 1937+21)is probably a strange star,or at least some neutron star equations of state should be ruled out,if we suggest that a...According to the observational limits on the radius and mass,the fastest rotating pulsar(PSR 1937+21)is probably a strange star,or at least some neutron star equations of state should be ruled out,if we suggest that a dipole magnetic field is relevant to its radio emission.We presume that the millisecond pulsar is a trange star with much low mass,small radius and weak magnetic moment.展开更多
The effects of aberration,retardation and magnetic field sweep back,which are caused directly or indirectly by pulsar’s rapid rotation,are estimated in order to examine their influences on the geometry asymmetry of t...The effects of aberration,retardation and magnetic field sweep back,which are caused directly or indirectly by pulsar’s rapid rotation,are estimated in order to examine their influences on the geometry asymmetry of the mean pulse profile.The geometric asymmetry exhibits different behaviors at different cases.The millisecond pulsars incline to develop mean pulse profiles with asymmetric contrary to the normal pulsars.The pulsar J0437-4715 is analyzed as an example.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19773001the Astronomy Project of Climbing Program of National Commit tee of Science and Technology of ChinaDoctoral Program Foundation of Higher Education of China.
文摘Using a new method of multi-frequency of K parameter,we estimate the ratio of altitudes of radio emission region of pulsars at 430 and 1418 MHz.The value of the ratio is 1.34±0.12 and the power law index of altitude-frequency is 0.24±0.08.It is indicated that the lower radio frequencies originate further out and the emission region is radially narrow.
基金Supported by the National Natural Science Foundation of China under Grant No.19803001the Special Funds for Major State Basic Research Projects of China。
文摘According to the observational limits on the radius and mass,the fastest rotating pulsar(PSR 1937+21)is probably a strange star,or at least some neutron star equations of state should be ruled out,if we suggest that a dipole magnetic field is relevant to its radio emission.We presume that the millisecond pulsar is a trange star with much low mass,small radius and weak magnetic moment.
基金Supported by the National Natural Science Foundation of China under Grant No.19773001the Climbing Program from the state Science and Technology Commission of China,and the Doctoral Program Foundation of Higher Education in China.
文摘The effects of aberration,retardation and magnetic field sweep back,which are caused directly or indirectly by pulsar’s rapid rotation,are estimated in order to examine their influences on the geometry asymmetry of the mean pulse profile.The geometric asymmetry exhibits different behaviors at different cases.The millisecond pulsars incline to develop mean pulse profiles with asymmetric contrary to the normal pulsars.The pulsar J0437-4715 is analyzed as an example.
