Volume 526, February 2011
|Number of page(s)||7|
|Published online||04 January 2011|
Spin period evolution of a recycled pulsar in an accreting binary
National Astronomical Observatories, Chinese Academy of
100012, PR China ,
2 Department of Physics, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
3 School of Space Science and Physics, Shandong University, Weihai 264209, PR China
4 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, PR China
Accepted: 7 November 2000
We investigate the spin period evolutions of recycled pulsars in binary accreting systems. Taking both the accretion induced field decay and spin-up into consideration, we calculate their spin period evolutions influenced by the initial magnetic field strengths, initial spin periods, and accretion rates. The results indicate that the minimum spin period (or maximum spin frequency) of a millisecond pulsar (MSP) is independent of the initial conditions and accretion rate when the neutron star (NS) accretes the mass of ~0.2 M⊙. The accretion torque with the fastness parameter and gravitational wave (GW) radiation torque may be responsible for the formation of the minimum spin period (maximum spin frequency). The fastest spin frequency (716 Hz) of MSP can be inferred to associate with a critical fastness parameter of about ωc = 0.55. Furthermore, comparisons with the observational data are presented in the field period (B − P) diagram.
Key words: accretion: accretion disks / stars: neutron / X-rays: binaries / pulsars: general
© ESO, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.