Poster
B. Mosser, K. Belkacem, M. S. Cunha, S. Deheuvels, M. Matteuzzi, C. Pinçon, M. Takata
Abstract
A large interest of red giant seismology comes from the ability of dipole modes, which
behave has mixed modes, to probe the stellar core of the evolved stars. Unique information has
been derived from the mixed-mode pattern, such as evolutionary stage, core rotation, mass
transfer, buoyancy glitches…The careful analysis of individual oscillation spectra shows that
extra peaks are sometimes present in core-helium burning stars, which do not follow the
asymptotic expansion derived from the coupling of a gravity cavity and a pressure cavity. We
used the formalism developed to account for complicated cases, as the presence of strong
structure glitches or multiple cavities (Cunha et al. 2015, Deheuvels & Belkacem 2018, Pinçon &
Takata 2022), to decipher the extra peaks. We could interpret them in terms or supernumerary
mixed modes. The determination of the extra asymptotic terms associated with the additional
modes makes it possible to better describe the core structure of these stars.
8th TESS/15th Kepler Asteroseismic Science Consortium Workshop
Porto, Portugal
2024 July
