J/A+A/706/L5ivo://CDS.VizieR/J/A+A/706/L5CDSMosser B.Takata M.Pincon C.Cunha M.S.Vrard M.Belkacem K.,Deheuvels S.Matteuzzi M.2026-03-02T06:25:50Z2026-01-29T09:42:45ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frstellar-associationsasteroseismologyvisible-astronomyDipole mixed modes observed in the oscillation pattern of red giant stars probe the radiative regions in the stellar core. Oscillation spectra of helium-core-burning stars sometimes show extra peaks that remain unexplained by the dipole mixed-mode pattern expected from the coupling of a radiative cavity in the stellar core and a pressure cavity in the stellar envelope. We use the asymptotic expansion developed for a multi-cavity star in order to characterize these extra peaks. The analytical resonance condition of the multi-cavity gravito-acoustic modes, with two inner gravity cavities and an outer pressure cavity, helps us explain that the apparent extra peaks are dipole mixed modes that follow the three-cavity oscillation pattern. The derivation of the two asymptotic period spacings associated with the two distinct regions in the radiative core provides an estimate of the full radiative cavity. Our results provide new constraints for analyzing the overshoot or mixing in the core of helium-core-burning stars. An important structure discontinuity inside the radiative core may explain the larger than expected observed period spacings.2026A&A...706L...5Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/706/L5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/706/L5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/706/L5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/706/L5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/706/L5https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/706/L5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/706/L5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/706/L5/table1 (Seismic global parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/706/L5/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/706/L5/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/706/L5/table1?GETtext/xml+votable180.050000true290.683268637.21910310.0055555555555555565/3683 3688 6/14573 14577 14579 14582 14584-14585 14762 14768 14773 14826 14923-14924 14928-14930 14944 14961 14965 14969 14974 15133https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/706/L5?format=asciiOpticaldefaultJ/A+A/706/L5/table1Seismic global parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKIC numbermeta.id;meta.mainintDnuLarge separationuHzem.freq;src.varfloatqCoupling factor between p- and g-cavitystat.fit.paramfloatDPi1oPeriod spacing of the outer g-cavitystime.periodfloatqgCoupling factor between the g-cavitiesstat.fit.paramfloatDPi1iPeriod spacing of the inner g-cavitystime.periodfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main