Near-periodical spin period evolution in the binary system LMC X-4

Abstract

In this paper we investigated the long-term evolution of the pulse-period in the high-mass X-ray binary LMC X-4 by taking advantage of more than 43~yrs of measurements in the X-ray domain. Our analysis revealed for the first time that the source is displaying near-periodical variations of its spin period on a time scale of roughly 6.8~yrs, making LMC X-4 one of the known binary systems showing remarkable long term spin torque reversals. We discuss different scenarios to interpret the origin of these torque reversals.

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• Observations of the X-ray pulsar LMC X-4 with NuSTAR: limit on the magnetic field and tomography of the system in the fluorescent iron line
• Post-flare Formation of the Accretion Stream and a Dip in Pulse Profiles of LMC X-4
• Detection of nearly periodic spin period reversals in Vela X-1 on long time-scales: inkling of solar-like cycle in the donor star?
• Discovery of pulsation dropout and turn-on during the high state of the accreting X-ray pulsar LMC X-4
• A new pulsating neutron star in the Ultraluminous X-ray source NGC 4559 X7?
• Timing and Spectral Analysis of HMXB OAO 1657-415 with NuSTAR
• Torque reversal and cyclotron absorption feature in HMXB 4U 1538-522
• Peculiarities of super-Eddington flares from the X-ray pulsar LMC X-4 with NuSTAR