Multiwavelength monitoring of a very active dwarf nova AX J1549.8-5416 with an unusually high duty cycle

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dc.contributor.authorZhang, Guobao
dc.contributor.authorGelfand, Joseph D.
dc.contributor.authorRussell, David M.
dc.contributor.authorLewis, Fraser
dc.contributor.authorMasetti, Nicola
dc.contributor.authorBernardini, Federico
dc.contributor.authorAndruchow, Ileana
dc.contributor.authorZibecchi L.
dc.date.accessioned2024-04-17T15:19:32Z
dc.date.available2024-04-17T15:19:32Z
dc.date.issued2017-08
dc.descriptionIndexación: Scopus
dc.description.abstractWe present the results of our analysis of new optical, ultraviolet (UV) and X-ray observations of a highly variable source - AX J1549.8-5416. Both the detection of several fast rise, exponential decay outbursts in the optical light curve and the lack of He II emission lines in the optical spectra suggest AX J1549.8-5416 is a cataclysmic variable of the dwarf nova (DN) type. The multiwavelength analysis of three mini-outbursts and one normal outburst represent one of the most complete multiwavelength studies of a DN and help to refine the relationship between the X-ray, UV and optical emission in this system. We find that the UV emission is delayed with respect to the optical by 1.0 5.4 d during the rising phase of the outburst. The Xray emission is suppressed during the peak of the optical outburst and recovers during the end of the outburst. From our analysis of archival Swift, Chandra and XMM Newton observations of AX J1549.8-5416, we estimate this DN has a high duty cycle (∼50 per cent), suggesting a quiescent X-ray luminosity larger than 1032 erg s-1. We also find the X-ray and UV flux are roughly anticorrelated. Furthermore, we find that, at low X-ray fluxes, the X-ray spectrum is well described by a single temperature thermal plasma model, while at high X-ray fluxes, an isobaric cooling flow model also works. We find that the maximum temperature of the plasma in quiescence is significantly higher than that in outburst. © 2017 The Authors.
dc.description.urihttps://academic-oup-com.recursosbiblioteca.unab.cl/mnras/article/469/4/4236/3807088
dc.identifier.citationMonthly Notices of the Royal Astronomical Society Volume 469, Issue 4, Pages 4236 - 42481 August 2017
dc.identifier.doi10.1093/mnras/stx1106
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/56062
dc.language.isoen
dc.publisherOxford University Press
dc.rights.licenseCC BY 4.0 DEED Atribución 4.0 Internacional
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectStars: dwarf novae
dc.subjectStars: individual: AX J1549.8-5416
dc.subjectX-rays: binaries
dc.titleMultiwavelength monitoring of a very active dwarf nova AX J1549.8-5416 with an unusually high duty cycle
dc.typeArtículo
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