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Optical and X-ray study of the peculiar high-mass X-ray binary XMMU J010331.7-730144

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cris.lastimport.scopus2024-02-12T20:21:23Z
dc.abstract.enFor a long time XMMU J010331.7-730144 was proposed as a high-mass X-ray binary candidate based on its X-ray properties, however, its optical behaviour was unclear - in particular previous observations did not reveal key Balmer emission lines. In this paper, we report on optical and X-ray variability of the system. XMMU J010331.7-730144 has been monitored with the Optical Gravitational Lensing Experiment (OGLE) in the I and V bands for the past 9 yr where it has shown extremely large amplitude outbursts separated by long periods of low-level flux. During its most recent optical outburst we obtained spectra with the Southern African Large Telescope (SALT) where, for the first time, the H α line is seen in emission, confirming the Be nature of the optical companion. The OGLE colour-magnitude diagrams also exhibit a distinct loop that is explained by changes in mass-loss from the Be star and mass outflow in its disc. In the X-rays, XMMU J010331.7-730144 has been monitored by the Neil Gehrels Swift Observatory through the S-CUBED programme. The X-ray flux throughout the monitoring campaign shows relatively low values for a typical Be/X-ray binary system. We show, from the analysis of the optical data, that the variability is due to the Be disc density and opacity changing rather than its physical extent as a result of efficient truncation by the NS. The relatively low X-ray flux can then be explained by the neutron star normally accreting matter at a low rate due to the small radial extent of the Be disc.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMonageng, I. M.
dc.contributor.authorCoe, M. J.
dc.contributor.authorBuckley, D. A. H.
dc.contributor.authorMcBride, V. A.
dc.contributor.authorKennea, J. A.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorEvans, P. A.
dc.contributor.authorClark, J. S.
dc.contributor.authorNegueruela, I.
dc.date.accessioned2024-01-25T15:58:06Z
dc.date.available2024-01-25T15:58:06Z
dc.date.copyright2020-06-13
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number3
dc.description.versionORIGINAL_AUTHOR
dc.description.volume496
dc.identifier.doi10.1093/MNRAS/STAA1739
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114963
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020MNRAS.496.3615M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages3615-3622
dc.rightsOther
dc.sciencecloudnosend
dc.titleOptical and X-ray study of the peculiar high-mass X-ray binary XMMU J010331.7-730144
dc.typeJournalArticle
dspace.entity.typePublication