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Swift J004427.3-734801 - a probable Be/white dwarf system in the Small Magellanic Cloud

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dc.abstract.enSwift J004427.3-734801 is an X-ray source in the Small Magellanic Cloud (SMC) that was first discovered as part of the Swift S-CUBED programme in 2020 January. It was not detected in any of the previous 3 yr worth of observations. The accurate positional determination from the X-ray data has permitted an optical counterpart to be identified that has the characteristics of an O9V-B2III star. Evidence for the presence of an infrared excess and significant I-band variability strongly suggests that this is an OBe-type star. Over 17 yr worth of optical monitoring by the OGLE (Optical Gravitational Lensing Experiment) project reveals periods of time in which quasi-periodic optical flares occur at intervals of ∼21.5 d. The X-ray data obtained from the S-CUBED project reveal a very soft spectrum, too soft to be that from accretion on to a neutron star or black hole. It is suggested here that this is a rarely identified Be star-white dwarf binary in the SMC.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorCoe, M. J.
dc.contributor.authorKennea, J. A.
dc.contributor.authorEvans, P. A.
dc.contributor.authorUdalski, Andrzej
dc.date.accessioned2024-01-26T09:25:30Z
dc.date.available2024-01-26T09:25:30Z
dc.date.copyright2020-05-06
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume497
dc.identifier.doi10.1093/MNRASL/SLAA112
dc.identifier.issn1745-3933
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/121222
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020MNRAS.497L..50C
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society: Letters
dc.relation.pagesL50-L55
dc.rightsOther
dc.sciencecloudnosend
dc.titleSwift J004427.3-734801 - a probable Be/white dwarf system in the Small Magellanic Cloud
dc.typeJournalArticle
dspace.entity.typePublication