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The SMC X-ray binary SXP4.78: a new Type II outburst and the identification and study of the optical counterpart

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dc.abstract.enSXP4.78 was originally discovered in 2000 as a pulsar in the Small Magellanic Cloud by the Rossi X-ray Timing Explorer, but it was not spatially located at that time. A new detection in 2018 with the Neil GehrelsSwift Observatory during a Type II outburst permitted its position to be accurately located and its optical counterpart to be identified. We report X-ray and optical monitoring covering epochs before and during the outburst. Using photometric data, we show the long-term variability of the Be disc where we present flux and colour changes associated with the disc growth and decay over a period of ∼6000 d. We show evidence of disc growth during the recent outburst through an increase in the H α equivalent width and photometric flux. Period analysis was performed using both optical photometric and spectroscopic data, but with no significant detection of an orbital period. A modest periodic signature of 2.65 d was detected from the Optical Gravitational Lensing Experiment (OGLE) I-band data, but we attribute that to the non-radial pulsations of the Be star. We also obtained a blue spectrum from the Southern African Large Telescope, which permits us to classify the spectral type as B0.5 IV-V.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMonageng, I. M.
dc.contributor.authorCoe, M. J.
dc.contributor.authorTownsend, L. J.
dc.contributor.authorBuckley, D. A. H.
dc.contributor.authorMcBride, V. A.
dc.contributor.authorRoche, P. D.
dc.contributor.authorKennea, J. A.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorEvans, P. A.
dc.date.accessioned2024-01-26T10:47:45Z
dc.date.available2024-01-26T10:47:45Z
dc.date.copyright2019-02-02
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number4
dc.description.versionORIGINAL_AUTHOR
dc.description.volume485
dc.identifier.doi10.1093/MNRAS/STZ723
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123141
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019MNRAS.485.4617M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages4617-4624
dc.rightsOther
dc.sciencecloudnosend
dc.titleThe SMC X-ray binary SXP4.78: a new Type II outburst and the identification and study of the optical counterpart
dc.typeJournalArticle
dspace.entity.typePublication