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

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arxiv 1610.09561 v1 pith:BP4LNYF5 submitted 2016-10-29 astro-ph.HE

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keywords binaryspinevolutionnear-periodicalperiodreversalstimetorque
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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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