Spin period evolution of a recycled pulsar in an accreting binary

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 r...

Full description

Saved in:
Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2011-02, Vol.526, p.A88
Main Authors: Wang, J., Zhang, C. M., Zhao, Y. H., Kojima, Y., Yin, H. X., Song, L. M.
Format: Article
Language:English
Subjects:
accretion: accretion disks
Astronomy
Earth, ocean, space
Exact sciences and technology
pulsars: general
stars: neutron
X-rays: binaries
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201015190