%0 Generic %1 saio2023evolutionary %A Saio, Hideyuki %A Nandal, Devesh %A Meynet, Georges %A Ekstöm, Sylvia %D 2023 %K astronomy betelgeuse stellar_evolution supernovae %T The evolutionary stage of Betelgeuse inferred from its pulsation periods %U http://arxiv.org/abs/2306.00287 %X 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_(19M_at ZAMS) with luminosities (log L/L_=5.27~5.28) and effective temperatures (log T_eff3.53) 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.

@misc{saio2023evolutionary, 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.}, added-at = {2023-08-30T10:42:45.000+0200}, author = {Saio, Hideyuki and Nandal, Devesh and Meynet, Georges and Ekstöm, Sylvia}, biburl = {https://www.bibsonomy.org/bibtex/205413c59a81fc17655398f11d0271d02/tabularii}, description = {The evolutionary stage of Betelgeuse inferred from its pulsation periods}, interhash = {6fd905964f12d1f27e5df569739ea0f8}, intrahash = {05413c59a81fc17655398f11d0271d02}, keywords = {astronomy betelgeuse stellar_evolution supernovae}, note = {cite arxiv:2306.00287Comment: 11 pages, 6 figures, submitted to MNRAS}, timestamp = {2023-09-06T14:33:19.000+0200}, title = {The evolutionary stage of Betelgeuse inferred from its pulsation periods}, url = {http://arxiv.org/abs/2306.00287}, year = 2023 }