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NICER Monitoring of Supersoft X-Ray Sources

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dc.contributor.authorLuna, Gerardo Juan Manuel
dc.date.accessioned2025-01-30T00:05:42Z
dc.date.available2025-01-30T00:05:42Z
dc.date.issued2022
dc.description.abstractWe monitored four supersoft sources - two persistent ones, CAL 83 and MR Vel, and the recent novae YZ Ret (Nova Ret 2020), and V1674 Her (Nova Her 2021) - with NICER. The two persistent supersoft X-ray sources (SSS) were observed with unvaried X-ray flux level and spectrum, respectively, 13 and 20 yr after the last observations. Short-period modulations of the SSS appear where the spectrum of the luminous central source was fully visible (in CAL 83 and V1674 Her) and were absent in YZ Ret and MR Vel, in which the flux originated in photoionized or shocked plasma, while the white dwarf (WD) was not observable. We thus suggest that the pulsations occur on, or very close to, the WD surface. The pulsations of CAL 83 were almost unvaried after 15 yr, including an irregular drift of the ≃67 s period by 2.1 s. Simulations, including previous XMM-Newton data, indicate actual variations in period length within hours, rather than an artifact of the variable amplitude of the pulsations. Large amplitude pulsations with a period of 501.53 ± 0.30 s were always detected in V1674 Her, as long as the SSS was observable. This period seems to be due to rotation of a highly magnetized WD. We cannot confirm the maximum effective temperature of (≃145,000 K) previously inferred for this nova, and discuss the difficulty in interpreting its spectrum. The WD appears to present two surface zones, one of which does not emit SSS flux
dc.description.filiationFil: Orio, M.. Istituto Nazionale di Astrofisica; Italia
dc.description.filiationFil: Gendreau, K.. National Aeronautics and Space Administration; Estados Unidos
dc.description.filiationFil: Giese, M.. University of Wisconsin; Estados Unidos
dc.description.filiationFil: Magdolen, J.. Slovak Academy of Sciences. Institute of Botany; Eslovaquia
dc.description.filiationFil: Pei, S.. Università di Padova; Italia
dc.description.filiationFil: Sun, B.. University of Missouri; Estados Unidos
dc.description.filiationFil: Behar, E.. Technion - Israel Institute of Technology; Israel
dc.description.filiationFil: Dobrotka, A.. Slovak Academy of Sciences. Institute of Botany; Eslovaquia
dc.description.filiationFil: Mikolajewska, J.. Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences; Polonia
dc.description.filiationFil: Strohmayer, T. E.
dc.format.mimetypeapplication/pdf
dc.identifier.citationOrio, M.; Gendreau, K.; Giese, M.; Luna, Gerardo Juan Manuel; Magdolen, J.; et al. (2022) NICER Monitoring of Supersoft X-Ray Sources. Astrophysical Journal; 932 (1) pp. 45-64
dc.identifier.doihttp://dx.doi.org/10.3847/1538-4357/ac63be
dc.identifier.issn1538-4357
dc.identifier.urihttps://iopscience.iop.org/article/10.3847/1538-4357/ac63be
dc.identifier.urihttps://repositorio.unahur.edu.ar/handle/123456789/509
dc.journal.number1
dc.journal.pagination45-64
dc.journal.titleAstrophysical Journal
dc.journal.volume932
dc.language.isoeng
dc.publisherIOP Publishing
dc.rights.licenseinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.subject.ocde1Ciencias Exactas y Naturales
dc.subject.ocde2Ciencias Físicas
dc.subject.unahurCiencias Básicas y Aplicadas
dc.titleNICER Monitoring of Supersoft X-Ray Sources
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
relation.isAuthorOfPublication.latestForDiscovery780246c8-d7fb-43ba-b6f5-1ef1f4e7f242
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