A diagnosis of torque reversals in 4U 1626-67

Details A diagnosis of torque reversals in 4U 1626-67 A diagnosis of torque reversals in 4U 1626-67

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...518a..19z&link_type=abstract

Astronomy and Astrophysics, Volume 518, id.A19

Astronomy and Astrophysics

Astrophysics

1

Accretion, Accretion Disk, Stars: Neutron, X-Rays : Binaries, X-Rays: Individuals: 4U 1626-67, X-Rays: Stars

Scientific paper

Several X-ray pulsars have been observed to experience torque reversals, which provide important observational clues to the interaction between the neutron star magnetic field and the accretion disk. We review the current models proposed for the torque reversals and discuss their viability based on the observations of the quasi-periodic oscillations (QPOs) in 4U 1626-67. Most of these models seem to be incompatible with the evolution of the QPO frequencies if they are interpreted in terms of the beat frequency model. We suggest that winds or outflows from the neutron star and the accretion disk may play an important role in accounting for the spin-down in disk-fed neutron stars.

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