Abstract
We report the discovery of a decay in the superorbital period of the binary X-ray pulsar LMC X-4. Combining archival data and published long term X-ray light curves, we have found a decay in the third period in this system (P ∼ 30.3 day, P ∼ −2 × 10−5 s s−1). Along with this result, a comparison of the superorbital intensity variations in LMC X-4, Her X-1 and SMC X-1 is also presented.
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Paul, B., Kitamoto, S. Superorbital period variations in the X-ray pulsar LMC X-4. J Astrophys Astron 23, 33–38 (2002). https://doi.org/10.1007/BF02702462
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DOI: https://doi.org/10.1007/BF02702462