J/ApJ/838/115ivo://CDS.VizieR/J/ApJ/838/115doi:10.26093/cds/vizier.18380115CDSArentoft T.Brogaard K.Jessen-Hansen J.Silva Aguirre V.Kjeldsen H.,Mosumgaard J.R.Sandquist E.L.2018-03-12T08:38:41Z2017-12-08T09:33:54ZCDS support team

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

cds-question@unistra.frgiant-starsopen-star-clustersphotometryUsing data from the NASA spacecraft Kepler, we study solar-like oscillations in red giant stars in the open cluster NGC 6811. We determine oscillation frequencies, frequency separations, period spacings of mixed modes, and mode visibilities for eight cluster giants. The oscillation parameters show that these stars are helium-core-burning red giants. The eight stars form two groups with very different oscillation power spectra; the four stars with the lowest {Delta}{nu} values display rich sets of mixed l=1 modes, while this is not the case for the four stars with higher {Delta}{nu}. For the four stars with lowest {Delta}{nu}, we determine the asymptotic period spacing of the mixed modes, {Delta}P, which together with the masses we derive for all eight stars suggest that they belong to the so-called secondary clump. Based on the global oscillation parameters, we present initial theoretical stellar modeling that indicates that we can constrain convective-core overshoot on the main sequence and in the helium-burning phase for these ~2M_{sun}_ stars. Finally, our results indicate less mode suppression than predicted by recent theories for magnetic suppression of certain oscillation modes in red giants.2017ApJ...838..115Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/838/115CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/ApJ/718/L97 : Early asteroseismic results from Kepler (Van Grootel+, 2010)J/A+A/525/A131 : Solar-like oscillations in Kepler red giants (Hekker+, 2011)J/A+A/531/A124 : Visibilities of stellar oscillation modes (Ballot+, 2011)J/A+A/540/A143 : Oscillations of red giants observed by Kepler (Mosser+, 2012)J/MNRAS/434/1422 : Atmospheric param. of FGKM stars (Molenda-Zakowicz+, 2013)J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)J/ApJS/215/19 : APOKASC catalog of Kepler red giants (Pinsonneault+, 2014)J/A+A/572/L5 : Evolution state of red giants from seismology (Mosser+, 2014)J/MNRAS/452/2127 : Fundamental param. of Kepler stars (Silva Aguirre+, 2015)J/ApJS/224/19 : The KepVIM catalog (Makarov+, 2016)J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)J/ApJ/835/172 : Kepler asteroseismic LEGACY sample. I. OscillationsJ/ApJ/835/173 : Kepler asteroseismic LEGACY sample. II. (Silva Aguirre+, 2017)J/A+A/598/A62 : KIC red giants showing depressed mixed modes (Mosser+, 2017)J/A+A/600/A1 : Coupling factors of 5166 KIC (Mosser+, 2017)J/ApJS/229/30 : Revised properties of Q1-17 Kepler targets (Mathur+, 2017)http://archive.stsci.edu/kepler/ : MAST Kepler home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/838/115https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/838/115http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/838/115https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/838/115https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/838/115http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/838/115GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/838/115/giants (Asteroseismic parameters and other properties for the red giants in NGC 6811 (table 1) along with the results from BaSTI Grid Modeling (table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/115/giants?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/115/giants?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/115/giants?GETtext/xml+votable180.050000true294.394271946.40276060.0055555555555555566/14779 15120 15121https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/838/115?format=asciiOpticaldefaultJ/ApJ/838/115/table2List of frequencies for the eight starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICRed giant KIC number in NGC6811meta.id;meta.mainintFreq[33.5/145.2] Oscillation frequencyuHzem.freqfloate_Freq[0.02/0.09] Uncertainty in FrequHzstat.errorfloatS/N[0.4/37] Signal-to-noisestat.snrfloatl[0/3]? l mode-identification, l-value (1)stat.fit.paramintnullableu_lUncertainty flag on l (1)meta.code.errorcharn[5/17]? n mode-identification, n-value (1)stat.fit.paramintnullableJ/ApJ/838/115/giantsAsteroseismic parameters and other properties for the red giants in NGC 6811 (table 1) along with the results from BaSTI Grid Modeling (table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNfList of frequencies for this star (table 2)meta.numberintnullableKIC[9409513/9776739] KIC numbermeta.id;meta.mainintDelnu[4.8/8.6] Frequency spacing {Delta}{nu}uHzem.freqfloate_DelnuDelnu uncertaintyuHzstat.errorfloatdel02[0.5/1] Frequency separation {delta}_02_ (1)uHzem.freq;src.varfloate_del02delO2 uncertaintyuHzstat.errorfloateps[0.8/1.1] Value of {epsilon} (1)stat.fit.paramfloate_epseps uncertaintystat.errorfloatnumax[53/108] Frequency of maximum power {nu}_max_uHzem.freq;src.varfloate_numaxnumax uncertaintyuHzstat.errorfloatDelPobs[100/190] Observed period spacing {Delta}P_obs_stime.periodinte_DelPobsDelPobs uncertaintysstat.errorintl_DelP[>~] Limit flag on DelPmeta.code.errorDelP[125/227] Period spacing of the pure g-modes, {Delta}Pstime.periodinte_DelP? DelP uncertaintysstat.errorintnullableTeff[4826/5027] Effective temperatureKphys.temperature.effectiveinte_Teff[100] Teff uncertaintyKstat.error;phys.temperature.effectiveintMscal[2/2.4] Mass derived from scaling relations described in Section 6solMassphys.massfloate_MscalMscal uncertaintysolMassstat.errorfloatRscal[8/12.2] Radius (see Section 6)solRadphys.size.radiusfloate_RscalRscal uncertaintysolRadstat.errorfloatlogg[2.6/3] Surface gravity from the asteroseismic parameters logg_seis_ (1)phys.gravityfloattau[14/29] Mode lifetime (see section 8)dtime.epochinte_tautau uncertaintydstat.errorintKCatDisplay data from the Kepler Input Catalog (V/133) and Mathur+, 2017, J/ApJS/229/30meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharMmo[2.1/2.4] BaSTI model masssolMassphys.massfloate_Mmo[0/0.09] Negative uncertainty on MmosolMassstat.errorfloatE_Mmo[0/0.2] Positive uncertainty on MmosolMassstat.error;stat.maxfloatRmo[8/12.3] BaSTI model radiussolRadphys.size.radius;meta.modelledfloate_Rmo[0/0.2] Negative uncertainty on RmosolRadstat.errorfloatE_Rmo[0/0.2] Positive uncertainty on RmosolRadstat.error;stat.maxfloatTmo[4886/5003] BaSTI model temperatureKphys.temperatureinte_Tmo[0/39] Negative uncertainty on TmoKstat.errorintE_Tmo[0/52] Positive uncertainty on TmoKstat.error;stat.maxint_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