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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8281
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dc.contributor.authorJain, Chetana-
dc.contributor.authorSharma, Rahul-
dc.contributor.authorPaul, Biswajit-
dc.date.accessioned2024-06-06T11:25:09Z-
dc.date.available2024-06-06T11:25:09Z-
dc.date.issued2024-03-18-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2024, Vol.529, p4056en_US
dc.identifier.urihttp://hdl.handle.net/2289/8281-
dc.descriptionOpen Accessen_US
dc.description.abstractWe report here results from pulse arri v al time delay analysis of the eclipsing high-mass X-ray binary (HMXB) pulsar LMC X-4 using observations made with the Rossi X-ray Timing Explorer , XMM –Newton, NuSTAR ( Nuclear Spectroscopic Telescope ARray ), and AstroSat . Combining the orbital parameters determined from these observations with the historical measurements dating back to 1998, we have extended the T π/2 epoch history of LMC X-4 by about 4600 binary orbits spanning about 18 yr. We also report mid-eclipse time measurements ( T ecl ) using data obtained from wide-field X-ray monitors of MAXI -GSC (Monitor of All-sky X ray Image –Gas Slit Camera) and Swift - BAT ( Burst Alert Telescope ). Combining the new T π/2 and T ecl estimates with all the previously reported values, we have significantly improved the orbital evolution measurement, which indicates that the orbital period is evolving at a time-scale ( P orb / ˙P orb ) of about 0.8 Myr. For the first time in an accreting X-ray pulsar system, we confirm the existence of a second deri v ati ve of the orbital period, having an evolution time-scale ( ˙P orb / ¨P orb ) of about 55 yr. Detection of a second deri v ati ve of the orbital period in LMC X-4 makes its orbital evolution time-scale more uncertain, which may also be true for other HMXBs. Independent solutions for the orbital evolution measurement using the mid-eclipse data and the pulse timing data are consistent with each other, and help us put an upper limit of 0.009 on the eccentricity of the binary system.en_US
dc.language.isoenen_US
dc.publisherOxford University Press on behalf of Royal Astronomical Societyen_US
dc.relation.urihttps://ui.adsabs.harvard.edu/abs/2024MNRAS.529.4056J/abstracten_US
dc.relation.urihttps://arxiv.org/abs/2403.09595en_US
dc.relation.urihttps://doi.org/10.1093/mnras/stae784en_US
dc.rights2024, The Author(s)en_US
dc.subjectX-rays: binaries –(stars)en_US
dc.subjectpulsarsen_US
dc.subjectgeneral –starsen_US
dc.subjectneutron –X-rays –individualen_US
dc.subjectLMC X-4en_US
dc.titleA comprehensi v e study of orbital ev olution of LMC X-4: existence of a second deri v ati v e of the orbital perioden_US
dc.typeArticleen_US
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