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Poster Open Access

Consistent seismic probing of subgiant and red-giant stars using EGGMiMoSA

Farnir Martin; Dupret Marc-Antoine; Pinçon Charly

Context: Owing to the detection of mixed-modes, subgiant and red-giant stars provide a unique opportunity to probe the complete stellar structure of solar-like stars and to constrain stellar structure and evolution models.
Aims: Taking advantage of the asymptotic description of mixed-modes, we develop a method that coherently accounts for the complex oscillation spectra of subgiant and red-giant stars. We investigate the probing potential of this technique and define robust seismic indicators, relevant of the stellar structure in order to constrain stellar models. 
Results: The EGGMiMoSA (Extracting Guesses about Giants via Mixed-Modes Spectrum Adjustment) method is fast (less than a second execution) and allows to study the evolution of the typical mixed-modes spectra parameters along a grid of models ranging from the subgiant to the red-giant phases.

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  • Mosser, B., Pinçon, C., Belkacem, K., Takata, M., & Vrard, M. 2017, A&A, 600, A1

  • Pinçon, C., Takata, M., & Mosser, B. 2019, A&A, 626, A125

  • Pinçon, C., Goupil, M. J., & Belkacem, K. 2020, A&A, 634, A68

  • Shibahashi, H. 1979, PASJ, 31, 87

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