5 research outputs found
Pulsar Spindown by a Fall-Back Disk and the P-P_dot Diagram
Neutron stars may be surrounded by fall-back disks formed from supernova
core-collapse. If the disk circumscribes the light-cylinder, the neutron star
will be an active radio pulsar spinning down under the propeller spin-down
torque applied by the disk as well as the usual magnetic dipole radiation
torque. Evolution across the P-P_dot diagram is very rapid when pulsar
spin-down is dominated by the propeller torque. This explains the distribution
of pulsars in the P-P_dot diagram.Comment: 10 pages, 5 figures, aastex, final version accepted for publication
in ApJ
On Period and Burst Histories of AXPs and SGRs and the Possible Evolution of these Objects on the P-Pdot Diagram
In this paper, timing data for all of the anomalous X-ray pulsars and soft
gamma repeaters are compiled. Timing properties of these objects are
investigated. The effect of bursts of soft gamma repeaters on their period
history is investigated. The P-Pdot diagram for pulsars, X-ray binaries,
anomalous X-ray pulsars, soft gamma repeaters and dim radio quiet netron stars
is constructed. The possible evolutionary tracks for anomalous X-ray pulsars,
soft gamma repeaters and dim radio quiet netron stars are examined.Comment: 66 pages, 9 figures, submitted to Turkish Journal of Physic