J/A+A/600/A1ivo://CDS.VizieR/J/A+A/600/A1doi:10.26093/cds/vizier.36000001CDSMosser B.Pincon C.Belkacem K.Takata M.Vrard M.2019-05-02T09:33:03Z2017-08-07T12:08:31ZCDS support team

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

cds-question@unistra.frgiant-starsspectroscopyThe power of asteroseismology relies on the capability of global oscillations to infer the stellar structure. For evolved stars, we benefit from unique information directly carried out by mixed modes that probe their radiative cores. This third article of the series devoted to mixed modes in red giants focuses on their coupling factors, which have remained largely unexploited up to now. With the measurement of coupling factors, we intend to give physical constraints on the regions surrounding the radiative core and the hydrogen-burning shell of subgiants and red giants. A new method for measuring the coupling factor of mixed modes was implemented, which was derived from the method recently implemented for measuring period spacings. This new method was automated so that it could be applied to a large sample of stars. Coupling factors of mixed modes were measured for thousands of red giants. They show specific variation with mass and evolutionary stage. Weak coupling is observed for the most evolved stars on the red giant branch only; large coupling factors are measured at the transition between subgiants and red giants as well as in the red clump. The measurement of coupling factors in dipole mixed modes provides a new insight into the inner interior structure of evolved stars. While the large frequency separation and the asymptotic period spacings probe the envelope and core, respectively, the coupling factor is directly sensitive to the intermediate region in between and helps determine its extent. Observationally, the determination of the coupling factor is a prior to precise fits of the mixed-mode pattern and can now be used to address further properties of the mixed-mode pattern, such as the signature of buoyancy glitches and core rotation.2017A&A...600A...1Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/600/A1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/A+A/540/A143 : Oscillations of red giants observed by Kepler (Mosser+, 2012)J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/600/A1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/600/A1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/600/A1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/600/A1https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/600/A1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/600/A1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/600/A1/couplage (Seismic global parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/600/A1/couplage?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/600/A1/couplage?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/600/A1/couplage?GETtext/xml+votable180.050000true291.0561836.7040410.0055555555555555564/922-923 933-935 944-946 5/3645-3647 3683 3704 3706 3729-3731 3760 3788-3789 3792 6/14559 14567 14573 14575 14577-14579 14730-14731 14738 14744 14746-14747 14749-14751 14792 14794-14795 14822 14828 14830-14831 14914-14915 15044-15045 15057 15059-15062 15160 15172-15174 15177-15178 15200 15232https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/600/A1?format=asciidefaultJ/A+A/600/A1/couplageSeismic global parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKIC numbermeta.id;meta.mainlongDnuLarge separationuHzem.freq;src.vardoubleDPi1Period spacingstime.perioddoubleqCoupling factormeta.codefloate_qUncertainty in qstat.errorfloatMassMass (seismic estimate)solMassphys.massfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Kepler Input Catalog (V/133) (right ascension part)degpos.eq.ra;meta.main_DEPositions from Kepler Input Catalog (V/133) (declination part)degpos.eq.dec;meta.main