{
  "abstract": "We investigate the origin of long-term spectroscopic and photometric variability in the blue supergiant rho Leo, with particular emphasis on distinguishing between intrinsic pulsations and variability induced by a possible companion. Our analysis is based on an 11.5-year spectroscopic time series obtained at Tartu Observatory, complemented by high-cadence, high-resolution spectroscopy from the Hertzsprung SONG telescope and space-based photometry from TESS. We studied line-profile variability using normalised moments of the HeI 6678, HeI 5875, and SiIII 4552 lines. Periodic signals were identified using the generalised Lomb-Scargle periodogram with iterative pre-whitening, and their temporal stability was examined with the weighted wavelet Z-transform. We detect a persistent periodic signal at P = 16.46 d in the first and third moments, present throughout the full observing interval, with a radial-velocity amplitude of 3.9 km/s. This signal is also present in the SONG data and is visible in multiple spectral lines, indicating a global origin. Photometric observations reveal a dominant variability timescale near 33 d, approximately twice the spectroscopic period. The stable 16.46-day period, present throughout the entire observing interval, most likely results from non-radial pulsations of the supergiant. A binary origin of the signal is not excluded, but distinguishing between these scenarios is complicated by the supergiant's complex variability pattern.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28039",
  "author_total": 9,
  "authors": [
    {
      "name": "V. A. Checha"
    },
    {
      "name": "A. Aret"
    },
    {
      "name": "I. Kolka"
    },
    {
      "name": "T. Liimets"
    },
    {
      "name": "V. Mitrokhina"
    },
    {
      "name": "A. Kasikov"
    },
    {
      "name": "T. Eenmäe"
    },
    {
      "name": "S. P. D. Borthakur"
    },
    {
      "name": "H. Ramler"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6wk733tmvb0gk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28039",
  "fulltext_url": null,
  "id": "6wk733tmvb0gk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28039",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7204856456",
  "pdf_url": "https://arxiv.org/pdf/2608.28039",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6wk733tmvb0gk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.28039",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28039"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "A decade of radial-velocity monitoring of rho Leo: moment analysis and periodic variability",
  "title_text": "A decade of radial-velocity monitoring of rho Leo: moment analysis and periodic variability",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/6wk733tmvb0gk",
  "venue": "arXiv",
  "versions": []
}