Spectral energy distribution analysis of the supersoft X-ray source CAL 87: Multiwavelength constraints

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dc.contributor.authorStecchini, Paulo Eduardo Freire
dc.contributor.authorJablonski, Francisco
dc.contributor.authorDiaz, Marcos Perez
dc.contributor.authorOliveira, Alexandre Soares de
dc.contributor.authorD’Amico, Flavio
dc.contributor.authorPalivanas, Natália
dc.date.accessioned2026-02-05T13:29:58Z
dc.date.available2026-02-05T13:29:58Z
dc.date.issued22026-02
dc.description.abstractWe analyse the spectral energy distribution (SED) of the eclipsing supersoft X-ray source CAL 87 covering wavelengths from X-rays to the near-infrared. Our study incorporates 26 data points across ultraviolet to near-infrared, sourced from published literature, unpublished data, and new observations. In addition, archival XMM-Newton spectra were used to represent the X-ray emission. Care was taken to use out-of-eclipse flux measurements when the irradiated side of the companion faces the observer. The SED model includes contributions from a central source, a reprocessed accretion disk, and an irradiated companion star atmosphere, resulting in a good match to the observed fluxes. The revised and new parameters for the disk and the central source align with previous studies and match expectations for such systems. The temperature of the irradiated side of the companion star was estimated based on its B-V colour during the secondary eclipse. This work highlights the importance of broad wavelength coverage for understanding the properties of supersoft X-ray sources.
dc.description.physical9 f.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uriMCTI AEB: PO20VB.0009. CNPq: 310309. FAPESP: nº 2017/20309-7. CAPES: Código Financeiro 001.
dc.format.mimetypepdf
dc.format.mimetypejpeg
dc.identifier.affiliationINPE
dc.identifier.affiliationINPE
dc.identifier.affiliationUiversidade de São Paulo
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationINPE
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.bibliographicCitationSTECCHINI, P. E. F.; JABLONSKI, F.; DIAZ, M. P.; OLIVEIRA, A. S. de; D’AMICO, F.; PALIVANAS, N. Spectral energy distribution analysis of the supersoft X-ray source CAL 87: Multiwavelength constraints. Journal of High Energy Astrophysics, Amsterdam, v. 50, Seção Acesso restrito, p. 100467, fev. 2026. https://doi.org/10.1016/j.jheap.2025.100467.
dc.identifier.doi10.1016/j.jheap.2025.100467
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/1127
dc.language.isoen_US
dc.publisherElsevier
dc.rights.holderPaulo Eduardo Freire Stecchini
dc.rights.holderFrancisco Jablonski
dc.rights.holderMarcos Perez Diaz
dc.rights.holderAlexandre Soares de Oliveira
dc.rights.holderFlavio D’Amico
dc.rights.holderNatália Palivanas
dc.subject.keywordWhite dwarfs
dc.subject.keywordX-ray binaries
dc.subject.keywordSpectral energy distribution
dc.titleSpectral energy distribution analysis of the supersoft X-ray source CAL 87: Multiwavelength constraints
dc.typeArtigos de Periódicos

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