J/A+A/618/A109ivo://CDS.VizieR/J/A+A/618/A109doi:10.26093/cds/vizier.36180109CDSMosser B.Gehan C.Belkacem K.Samadi R.Michel E.Goupil M-J.2019-04-18T11:25:10Z2018-10-26T15:54:18ZCDS support team

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

cds-question@unistra.frgiant-starsspectroscopyOscillation modes with a mixed character, as observed in evolved low-mass stars, are highly sensitive to the physical properties of the innermost regions. Measuring their properties is therefore extremely important to probe the core, but requires some care, due to the complexity of the mixed-mode pattern. The aim of this work is to provide a consistent description of the mixed-mode pattern of low-mass stars, based on the asymptotic expansion. We also study the variation of the gravity offset epsilon_g_ with stellar evolution. We revisit previous works about mixed modes in red giants and empirically test how period spacings, rotational splittings, mixed-mode widths, and heights can be estimated in a consistent view, based on the properties of the mode inertia ratios. From the asymptotic fit of the mixed-mode pattern of a large set of red giants at various evolutionary stages, we derive unbiased and precise asymptotic parameters. As the asymptotic expansion of gravity modes is verified with a precision close to the frequency resolution for stars on the red giant branch (10^-4^ in relative values), we can derive accurate values of the asymptotic parameters. We decipher the complex pattern in a rapidly rotating star, and explain how asymmetrical splittings can be inferred. We also revisit the stellar inclinations in two open clusters, NGC 6819 and NGC 6791: our results show that the stellar inclinations in these clusters do not have privileged orientation in the sky. The variation of the asymptotic gravity offset with stellar evolution is investigated in detail. We also derive generic properties that explain under which conditions mixed modes can be observed.2018A&A...618A.109Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/618/A109CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)J/A+A/600/A1 : Coupling factors of 5166 KIC (Mosser+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/618/A109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/618/A109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/618/A109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/618/A109https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/618/A109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/618/A109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/618/A109/table1 (Seismic global parameters of the stars listed in the paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A109/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A109/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A109/table1?GETtext/xml+votable180.050000true291.0561836.7040410.0055555555555555565/3645 6/14567 14573 14575 14577-14579 14584-14586 14591 14733-14734 14744 14751-14752 14754-14758 14760 14765 14778 14782 14794 14827 14914-14918 14920-14922 14924 14931 14933-14936 14938 14940 14944-14945 14948 14950 14952 14954-14955 14958 14960 14972-14973 14975 15045 15061 15107 15126-15128 15135-15137 15140 15143 15156-15157 15171https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/618/A109?format=asciidefaultJ/A+A/618/A109/table1Seismic global parameters of the stars listed in the paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKIC numbermeta.idintnumaxFrequecy of maximum oscillation poweruHzem.freq;src.varfloate_numaxUncertainty in numaxuHzstat.errorfloatDnuLarge separationuHzem.freq;src.varfloate_DnuUncertainty in DnuuHzstat.errorfloatDPi1Period spacingstime.periodfloate_DPi1Uncertainty in DPi1sstat.errorfloatqCoupling factorarith.factorfloate_qUncertainty in qstat.errorfloatepsGravity mode offsetstat.fit.paramfloate_epsUncertainty in epsstat.errorfloatdnurot? Rotational splittingem.freq;src.varintnullablee_dnurot? Uncertainty in dnurotstat.errorintnullableSimbadSimbad 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