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Astrophysics > Solar and Stellar Astrophysics

arXiv:2306.00287 (astro-ph)
[Submitted on 1 Jun 2023]

Title:The evolutionary stage of Betelgeuse inferred from its
pulsation periods

Authors:Hideyuki Saio, Devesh Nandal, Georges Meynet, Sylvia Ekstom
Download a PDF of the paper titled The evolutionary stage of
Betelgeuse inferred from its pulsation periods, by Hideyuki Saio and
2 other authors
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    Abstract: Betelgeuse is a well known bright red supergiant that
    shows semi-regular variations with four approximate periods of
    2200, 420, 230, and 185 days. While the longest period was
    customarily regarded as LSP (long secondary period) of unknown
    origin, we identify the ~2200-d period as the radial fundamental
    mode, and the three shorter periods as the radial first, second,
    and third overtones. From a nonadiabatic pulsation analysis
    including the pulsation/convection coupling, we have found that
    these radial pulsation modes are all excited in the envelope of a
    model in a late stage of the core-carbon burning. Models with
    similar pulsation property have masses around 11M_\odot (19M_\
    odot at ZAMS) with luminosities (log L/L_\odot =5.27~5.28) and
    effective temperatures (log T_{eff}\approx 3.53) that are
    consistent with the range of the observational determinations. We
    also find that a synthetic light curve obtained by adding the
    fundamental and the first-overtone mode qualitatively agrees with
    the light curve of Betelgeuse up to the Great Dimming. We
    conclude that Betelgeuse is in the late stage of core carbon
    burning, and a good candidate for the next Galactic supernova.

Comments: 11 pages, 6 figures, submitted to MNRAS
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Cite as:  arXiv:2306.00287 [astro-ph.SR]
          (or arXiv:2306.00287v1 [astro-ph.SR] for this version)
          https://doi.org/10.48550/arXiv.2306.00287
          Focus to learn more
          arXiv-issued DOI via DataCite

Submission history

From: Hideyuki Saio [view email]
[v1] Thu, 1 Jun 2023 02:05:44 UTC (413 KB)
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