Multiband study of RX J0838-2827 and XMM J083850.4-282759: A new asynchronous magnetic cataclysmic variable and a candidate transitional millisecond pulsar

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dc.contributor.authorRea, N.
dc.contributor.authorCoti Zelati, F.
dc.contributor.authorEsposito, P.
dc.contributor.authorD'Avanzo, P.
dc.contributor.authorde Martino, D.
dc.contributor.authorIsrael, G.L.
dc.contributor.authorTorres, D.F.
dc.contributor.authorCampana, S.
dc.contributor.authorBelloni, T.M.
dc.contributor.authorPapitto, A.
dc.contributor.authorMasetti, N.
dc.contributor.authorCarrasco, L.
dc.contributor.authorPossenti, A.
dc.contributor.authorWieringa, M.
dc.contributor.authorDe Oña Wilhelmi, E.
dc.contributor.authorLi, J.
dc.contributor.authorBozzo, E.
dc.contributor.authorFerrigno, C.
dc.contributor.authorLinares, M.
dc.contributor.authorTauris, T.M.
dc.contributor.authorHernanz, M.
dc.contributor.authorRibas, I.
dc.contributor.authorMonelli, M.
dc.contributor.authorBorghese, A.
dc.contributor.authorBaglio, M.C.
dc.contributor.authorCasares, J.
dc.date.accessioned2018-03-14T19:44:54Z
dc.date.available2018-03-14T19:44:54Z
dc.date.issued2017-11
dc.descriptionIndexación: Scopus.es_ES
dc.description.abstractIn a search for the counterpart to the Fermi-LAT source 3FGL J0838.8-2829, we performed a multiwavelength campaign: in the X-ray band with Swift and XMM-Newton; in the infrared and optical with OAGH, ESO-NTT and IAC80; and in the radio with ATCA observations. We also used archival hard X-ray data obtained by INTEGRAL. We report on three X-ray sources consistent with the position of the Fermi-LAT source.We confirm the identification of the brightest object, RX J0838-2827, as a magnetic cataclysmic variable that we recognize as an asynchronous system (not associated with the Fermi-LAT source). RX J0838-2827 is extremely variable in the X-ray and optical bands, and timing analysis reveals the presence of several periodicities modulating its X-ray and optical emission. The most evident modulations are interpreted as being caused by the binary system orbital period of ~1.64 h and the white dwarf spin period of ~1.47 h. A strong flux modulation at ~15 h is observed at all energy bands, consistent with the beat frequency between spin and orbital periods. Optical spectra show prominent Hß, He I and He II emission lines that are Doppler-modulated at the orbital period and at the beat period. Therefore, RX J0838-2827 accretes through a disc-less configuration and could be either a strongly asynchronous polar or a rare example of a pre-polar system on its way to reaching synchronism. Regarding the other two X-ray sources, XMM J083850.4-282759 showed a variable X-ray emission, with a powerful flare lasting for ~600 s, similar to what is observed in transitional millisecond pulsars during the subluminous disc state: this observation possibly means that this source can be associated with the Fermi-LAT source. © 2017 The Authors.es_ES
dc.description.urihttps://academic.oup.com/mnras/article/471/3/2902/4081953
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 471(3), pp. 2902-2916.es_ES
dc.identifier.issn0035-8711
dc.identifier.otherDOI: 10.1093/mnras/stx1560
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/5440
dc.language.isoenes_ES
dc.publisherOxford University Presses_ES
dc.subjectAccretion, accretion discses_ES
dc.subjectNovae, cataclysmic variableses_ES
dc.subjectPulsars: generales_ES
dc.subjectWhite dwarfses_ES
dc.subjectX-rays: individual: RX J0838-2827es_ES
dc.subjectX-rays: individual: XMM J083850.4-282759es_ES
dc.titleMultiband study of RX J0838-2827 and XMM J083850.4-282759: A new asynchronous magnetic cataclysmic variable and a candidate transitional millisecond pulsares_ES
dc.typeArtículoes_ES
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