Revised ephemeris and orbital period derivative of the supersoft X-ray source CAL 87 based on 34 yr of observations

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dc.contributor.authorStecchini, Paulo Eduardo Freire
dc.contributor.authorJablonski, Francisco José
dc.contributor.authorDiaz, Marcos P.
dc.contributor.authorD’Amico, Flávio
dc.contributor.authorOliveira, Alexandre Soares de
dc.contributor.authorPalivanas, Natália
dc.contributor.authorSaito, Roberto Kalbusch
dc.date.accessioned2025-02-27T14:24:02Z
dc.date.available2025-02-27T14:24:02Z
dc.date.issued22023
dc.description.abstractIn this study, we present an analysis of over 34 yr of observational data from CAL 87, an eclipsing supersoft X-ray source. The primary aim of our study, which combines previously analysed measurements as well as unexplored publicly available data sets, is to examine the orbital period evolution of CAL 87. After meticulously and consistently determining the eclipse timings, we constructed an O − C (observed minus calculated) diagram using a total of 38 data points. Our results provide confirmation of a positive derivative in the system’s orbital period, with a determined value of  s s−1. We observe a noticeable jitter in the eclipse timings and additionally identify a systematic delay in the X-ray eclipses compared to those observed in longer wavelengths. We discuss the interplay of the pertinent factors that could contribute to a positive period derivative and the inherent variability in the eclipses.
dc.description.physical5 p.
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.uriCNPq (317428/2023-3; 308298/2022-5 and 350104/2022-0) FAPESP (2017/20309-7) CAPES (88887.823264/2023-00)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade de São Paulo
dc.identifier.affiliationInstituto Nacional de Pesquisas Espaciais
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationUniversidade Federal de Santa Catarina
dc.identifier.bibliographicCitationSTECCHINI, Paulo Eduardo et al. Revised ephemeris and orbital period derivative of the supersoft X-ray source CAL 87 based on 34 yr of observations. Monthly Notices of the Royal Astronomical Society, v. 527, n. 3, p. 8991-8995, 2023. Disponível em: https://academic.oup.com/mnras/article/527/3/8991/7453663.
dc.identifier.doi10.1093/mnras/stad3678
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/598
dc.language.isoen_US
dc.publisherRoyal Astronomical Society
dc.rights.holderPaulo Eduardo Stecchini et al.
dc.subject.keywordStars: individual: CAL 87
dc.subject.keywordWhite dwarfs
dc.subject.keywordX-rays: binaries
dc.titleRevised ephemeris and orbital period derivative of the supersoft X-ray source CAL 87 based on 34 yr of observations
dc.typeArtigos de Periódicos

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