{
  "abstract": "We investigate the phase-resolved X-ray spectral evolution of the high-mass X-ray binary Cen X-3 across eclipse ingress and egress, using two out-of-eclipse intervals as references, to constrain the absorbing material and Fe K emitting regions with high-resolution XRISM/Resolve spectroscopy. We model the spectra with SPEX, including interstellar and local wind absorption, a power-law and blackbody continuum, disk reflection, and Gaussian components for Fe XXV and Fe XXVI. We compare the orbital variation of the absorbing column with a smooth CAK wind model and investigate the variability of the Fe K alpha line width. The local absorbing column varies by nearly two orders of magnitude, from N_H^local = 4.25 x 10^22 cm^-2 during pre-ingress to 5.9 x 10^23 cm^-2 at ingress. The excess ingress absorption cannot be reproduced by a smooth wind model alone, suggesting a localized overdense structure along the line of sight. The Fe K alpha width varies from approximately 510 km s^-1 during pre-ingress to 1400 km s^-1 during egress, with intermediate, statistically indistinguishable values of approximately 900 km s^-1 during ingress and post-egress. Highly ionized Fe XXV and Fe XXVI emission is detected throughout the orbit, although fewer components are resolved during ingress. These diagnostics reveal a complex circumstellar environment with localized dense material and multiple reprocessing regions. The results demonstrate the capability of XRISM/Resolve to probe the geometry and kinematics of accretion environments in eclipsing high-mass X-ray binaries.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.23748",
  "author_total": 10,
  "authors": [
    {
      "name": "J. Planelles-Villalva"
    },
    {
      "name": "L. Gu"
    },
    {
      "name": "J. J. Rodes-Roca"
    },
    {
      "name": "G. Sanjurjo-Ferrín"
    },
    {
      "name": "J. de Plaa"
    },
    {
      "name": "J. M. Torrejón"
    },
    {
      "name": "F. S. Porter"
    },
    {
      "name": "Y. Mochizuki"
    },
    {
      "name": "M. Loewenstein"
    },
    {
      "name": "E. Costantini"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9xw4r1k21bc55.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.23748",
  "fulltext_url": null,
  "id": "9xw4r1k21bc55",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.23748",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.23748",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9xw4r1k21bc55.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:56Z",
      "native_id": "2609.23748",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.23748"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Spectral Analysis of the Egress and Ingress Phases of Cen X-3 with XRISM/Resolve",
  "title_text": "Spectral Analysis of the Egress and Ingress Phases of Cen X-3 with XRISM/Resolve",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:56Z",
  "url": "https://research.draconitic.com/paper/9xw4r1k21bc55",
  "venue": "arXiv",
  "versions": []
}