Stecchini, Paulo Eduardo FreireJablonski, FranciscoDiaz, Marcos PerezOliveira, Alexandre Soares deD’Amico, FlavioPalivanas, Natália2026-02-052026-02-05https://repositorio.univap.br/handle/123456789/1127We 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 Our study incorporates 26 data points across ultraviolet to near-infrared, sourced from published literature, unpublished data, and new observations.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.pdfjpegen-USArtigos de PeriódicosPaulo Eduardo Freire StecchiniFrancisco JablonskiMarcos Perez DiazAlexandre Soares de OliveiraFlavio D’AmicoNatália Palivanas10.1016/j.jheap.2025.100467White dwarfsX-ray binariesSpectral energy distributionSTECCHINI, 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.INPEINPEUiversidade de São PauloUniversidade do Vale do ParaíbaINPEUniversidade do Vale do Paraíba