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X-ray spectra and light curves of cooling novae and a nova like

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dc.contributor.authorSun, Bangzheng
dc.contributor.authorOrio, Marina
dc.contributor.authorDobrotka, Andrej
dc.contributor.authorShugarov, Sergey
dc.contributor.authorZemko, Polina
dc.contributor.authorLuna, Gerardo Juan Manuel
dc.date.accessioned2025-01-30T15:57:42Z
dc.date.available2025-01-30T15:57:42Z
dc.date.issued2020
dc.description.abstractWe present X-ray observations of novae V2491 Cyg and KT Eri about 9 yr post-outburst of the dwarf nova and post-nova candidate EY Cyg, and of a VY Scl variable. The first three objects were observed with XMM-Newton, KT Eri also with the Chandra ACIS-S camera, V794 Aql with the Chandra ACIS-S camera and High Energy Transmission Gratings. The two recent novae, similar in outburst amplitude and light curve, appear very different at quiescence. Assuming half of the gravitational energy is irradiated in X-rays, V2491 Cyg is accreting at ˙m = 1.4 × 10-9-10-8 M⊙yr-1, while for KT Eri, ˙m < 2 × 10-10 M⊙ yr. V2491 Cyg shows signatures of a magnetized WD, specifically of an intermediate polar. A periodicity of 39 min, detected in outburst, was still measured and is likely due to WD rotation. EY Cyg is accreting at ˙m ∼ 1.8 × 10-11 M⊙ yr-1, one magnitude lower than KT Eri, consistently with its U Gem outburst behaviour and its quiescent UV flux. The X-rays are modulated with the orbital period, despite the system's low inclination, probably due to the X-ray flux of the secondary. A period of 81 min is also detected, suggesting that it may also be an intermediate polar. V794 Aql had low X-ray luminosity during an optically high state, about the same level as in a recent optically low state. Thus, we find no clear correlation between optical and X-ray luminosity: The accretion rate seems unstable and variable. The very hard X-ray spectrum indicates a massive WD.
dc.description.filiationSun, Bangzheng. University of Wisconsin; Estados Unidos
dc.description.filiationOrio, Marina. University of Wisconsin; Estados Unidos. Inaf Istituto di Astrofisica Spaziale e Fisica Cosmica; Italia
dc.description.filiationDobrotka, Andrej. Slovak University of Technology in Bratislava; Eslovaquia
dc.description.filiationFil: Luna, Gerardo Juan Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Universidad Nacional de Hurlingham. Instituto de Tecnología e Ingeniería; Argentina
dc.description.filiationShugarov, Sergey. Astronomical Institute of the Slovak Academy of Sciences; Eslovaquia. M.V. Lomonosov Moscow State University; Rusia
dc.description.filiationFil: Zemko, Polina. University of Padova; Italia
dc.format.mimetypeapplication/pdf
dc.identifier.citationSun, Bangzheng; Orio, Marina; Dobrotka, Andrej; Luna, Gerardo Juan Manuel; Shugarov, Sergey; et al. (2020) X-ray spectra and light curves of cooling novae and a nova like. Monthly Notices of the Royal Astronomical Society; 499 (2) , pp. 3006-3018
dc.identifier.doihttp://dx.doi.org/10.1093/mnras/staa3012
dc.identifier.issn0035-8711
dc.journal.number2
dc.journal.pagination3006-3018
dc.journal.titleMonthly Notices of the Royal Astronomical Society
dc.journal.volume499
dc.language.isoeng
dc.publisherWiley Blackwell
dc.rights.licenseinfo:eu-repo/semantics/restrictedAccess
dc.subject.ocde1Ciencias Exactas y Naturales
dc.subject.ocde2Ciencias Físicas
dc.subject.unahurCiencias Básicas y Aplicadas
dc.titleX-ray spectra and light curves of cooling novae and a nova like
dc.typeinfo:eu-repo/semantics/article
dc.type.oaireinfo:eu-repo/semantics/article
dc.type.snrdinfo:ar-repo/semantics/artículo
dc.type.versioninfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
relation.isAuthorOfPublication780246c8-d7fb-43ba-b6f5-1ef1f4e7f242
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