Radius of the neutron star magnetosphere during disk accretion

Abstract

The dependence of the spin frequency derivative $\dot{\nu }$ of accreting neutron stars with a strong magnetic field (X-ray pulsars) on the mass accretion rate (bolometric luminosity, $L_{bol}$) has been investigated for eight transient pulsars in binary systems with Be stars. Using data from the Fermi/GBM and Swift/BAT telescopes, we have shown that for seven of the eight systems the dependence $\dot{\nu }$ can be fitted by the model of angular momentum transfer through an accretion disk, which predicts the relation $\dot{\nu }\sim L_{bol}^{6/7}$. Hysteresis in the dependence $\dot{\nu }(L_{bol})$ has been confirmed in the system V 0332+53 and has been detected for the first time in the systems KS 1947+300, GRO J1008-57, and 1A 0535+26. The radius of the neutron star magnetosphere in all of the investigated systems have been estimated. We show that this quantity varies from pulsar to pulsar and depends strongly on the analytical model and the estimates for the neutron star and binary system parameters.

Astronomy Letters, 2017, Vol. 43, No. 11, pp. 706-729. Original russian text published in Pis'ma v Astronomicheskii Zhurnal, 2017, Vol. 43, No. 11, pp. 782-806

References in corpus (15)

• Constraints on neutron star radii based on chiral effective field theory interactions
• The ephemeris, orbital decay, and masses of 10 eclipsing HMXBs
• Accretion funnels onto weakly magnetized young stars
• Giant Outbursts in Be/X-ray Binaries
• 4U 0115+63 from RXTE and INTEGRAL Data: Pulse Profile and Cyclotron Line Energy
• Luminosity dependence of the cyclotron line and evidence for the accretion regime transition in V 0332+53
• On the distance of the Magellanic Clouds using Cepheid NIR and optical-NIR Period Wesenheit Relations
• Swift observations of SAX J1808.4-3658: monitoring the return to quiescence
• Now you see it, now you don't - the circumstellar disk in the GRO J1008--57 system
• On the relationship between circumstellar disc size and X-ray outbursts in Be/X-ray binaries
• Propeller effect in the transient X-ray pulsar SMC X-2
• NuSTAR Discovery of a Cyclotron Line in the Be/X-ray Binary RX J0520.5-6932 During Outburst
• Spin-up/spin-down of neutron star in Be-X-ray binary system GX 304-1
• Confirmation of a High Magnetic Field in GRO J1008-57
• 2S1553-542: a Be/X-ray binary pulsar on the far side of the Galaxy

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