J/MNRAS/469/4718ivo://CDS.VizieR/J/MNRAS/469/4718doi:10.26093/cds/vizier.74694718CDSBossini D.Miglio A.Salaris M.Vrard M.Cassisi S.Mosser B.,Montalban J.Girardi L.Noels A.Bressan A.Pietrinferni A.Tayar J.2024-08-17T20:19:38Z2020-06-02T15:45:45ZCDS support team

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

cds-question@unistra.frasteroseismologyopen-star-clustersConvective mixing in helium-core-burning (HeCB) stars is one of the outstanding issues in stellar modelling. The precise asteroseismic measurements of gravity-mode period spacing ({Delta}{Pi}_1_) have opened the door to detailed studies of the near-core structure of such stars, which had not been possible before. Here, we provide stringent tests of various core-mixing scenarios against the largely unbiased population of red-clump stars belonging to the old-open clusters monitored by Kepler, and by coupling the updated precise inference on {Delta}{Pi}_1_ in thousands of field stars with spectroscopic constraints. We find that models with moderate overshooting successfully reproduce the range observed of {Delta}{Pi}_1_ in clusters. In particular, we show that there is no evidence for the need to extend the size of the adiabatically stratified core, at least at the beginning of the HeCB phase. This conclusion is based primarily on ensemble studies of {Delta}{Pi}_1_ as a function of mass and metallicity. While {Delta}{Pi}_1_ shows no appreciable dependence on the mass, we have found a clear dependence of {Delta}{Pi}_1_ on metallicity, which is also supported by predictions from models.2017MNRAS.469.4718Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/469/4718CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)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/MNRAS/469/4718https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/469/4718http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/469/4718https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/469/4718https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/469/4718http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/469/4718GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/469/4718/tablea1 (*NGC 6819 stellar catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/469/4718/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/469/4718/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/469/4718/tablea1?GETtext/xml+votable180.050000true295.306958340.06061110.005555555555555556Cone search capability for table J/MNRAS/469/4718/tablea2 (*NGC 6791 stellar catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/469/4718/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/469/4718/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/469/4718/tablea2?GETtext/xml+votable180.050000true290.18987537.66413890.0055555555555555565/3688 6/14573 14575 14579-14580https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/469/4718?format=asciidefaultJ/MNRAS/469/4718/tablea1*NGC 6819 stellar cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNSequential number, within the clustermeta.recordintKICKIC numbermeta.id;meta.mainintnumax? Frequency of maximum oscillation poweruHzem.freq;stat.maxfloatnullableDnu? Mean large frequency separation of modes with the same degree and consecutive order, {DELTA}nuuHzstat.variancefloatnullableDPi1? Gravity-mode period spacing, {DELTA}{PI}1stime.periodfloatnullablee_DPi1? rms uncertainty on DPi1sstat.errorfloatnullableClassV[Yes ] Classified as red clump in Vrard et al. (2016A&A...588A..87V, Cat. J/A+A/588/A87)meta.codecharClass[RC RGB Unclear] This work classification (1)src.classcharRCsel[Yes No] Selected RC stars ?meta.codecharNotesNotesmeta.noteSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Simbad and KIC (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad and KIC (declination part)degpos.eq.dec;meta.mainJ/MNRAS/469/4718/tablea2*NGC 6791 stellar cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNSequential number, within the clustermeta.recordintKICKIC numbermeta.id;meta.mainintnumax? Frequency of maximum oscillation poweruHzem.freq;stat.maxfloatnullableDnu? Mean large frequency separation of modes with the same degree and consecutive order, {DELTA}nuuHzstat.variancefloatnullableDPi1? Gravity-mode period spacing, {DELTA}{PI}1stime.periodfloatnullablee_DPi1? rms uncertainty on DPi1sstat.errorfloatnullableClassV[Yes ] Classified as red clump in Vrard et al. (2016A&A...588A..87V, Cat. J/A+A/588/A87)meta.codecharClass[RC RGB Unclear] This work classification (1)src.classcharRCsel[Yes No] Selected RC stars ?meta.codecharNotesNotesmeta.noteSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Simbad and KIC (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad and KIC (declination part)degpos.eq.dec;meta.main