J/ApJ/729/L10ivo://CDS.VizieR/J/ApJ/729/L10doi:10.26093/cds/vizier.17299010CDSBasu S.Grundahl F.Stello D.Kallinger T.Hekker S.Mosser B.,Garcia R.A.Mathur S.Brogaard K.Bruntt H.Chaplin W.J.Gai N.,Elsworth Y.Esch L.Ballot J.Bedding T.R.Gruberbauer M.Huber D.,Miglio A.Yildiz M.Kjeldsen H.Christensen-Dalsgaard J.,Gilliland R.L.Fanelli M.M.Ibrahim K.A.Smith J.C.2017-12-21T15:26:26Z2012-10-25T08:48:53ZCDS support team

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

cds-question@unistra.fropen-star-clustersgiant-starsstellar-massesstellar-radiieffective-temperatureWe present initial results on some of the properties of open clusters NGC 6791 and NGC 6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating the mass, radius, and log g of stars on the red giant branch (RGB) of these clusters, we estimate the distance to the clusters and their ages. Our model-independent estimate of the distance modulus of NGC 6791 is (m-M)_0_=13.11+/-0.06. We find (m-M)_0_=11.85+/-0.05 for NGC 6819. The average mass of stars on the RGB of NGC 6791 is 1.20+/-0.01M_{sun}_, while that of NGC 6819 is 1.68+/-0.03M_{sun}_. It should be noted that we do not have data that cover the entire RGB and the actual mass will be somewhat lower. We have determined model-dependent estimates of ages of these clusters. We find ages between 6.8 and 8.6Gyr for NGC 6791, however, most sets of models give ages around 7Gyr. We obtain ages between 2 and 2.4Gyr for NGC 6819.2011ApJ...729L..10Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/729/L10CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/540/A143 : Oscillations of red giants observed by Kepler (Mosser+, 2012)J/A+A/531/A124 : Visibilities of stellar oscillation modes (Ballot+, 2011)J/A+A/525/A131 : Solar-like oscillations in Kepler red giants (Hekker+, 2011)J/ApJ/718/L97 : Early asteroseismic results from Kepler (Van Grootel+, 2010)J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)J/A+A/506/465 : Solar-like oscillations in red giants (Hekker+, 2009)J/AJ/133/1585 : Stromgren photometry in NGC 6791 (Anthony-Twarog+, 2007)J/MNRAS/358/795 : Variable stars in NGC 6819 field (Street+, 2005)J/AJ/129/656 : Infrared photometry of NGC 6791 (Carney+, 2005)J/AJ/129/2856 : Variable stars in NGC 6791 (Mochejska+, 2005)J/PASP/115/413 : BVI photometry in the open cluster NGC 6791 (Stetson+, 2003)J/AJ/123/3460 : Low-amplitude variables in NGC 6791 (Mochejska+, 2002)J/A+AS/114/1 : CCD UBVI photometry of NGC 6791 (Kaluzny+, 1995)J/AJ/108/585 : UBVI photometry of NGC 6791 (Montgomery+, 1994)J/MNRAS/243/492 : BV Photometry of NGC 6791. (Kaluzny 1990)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/729/L10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/729/L10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/729/L10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/729/L10https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/729/L10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/729/L10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/729/L10/table1 (Properties of stars in NGC 6791 and NGC 6819)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/729/L10/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/729/L10/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/729/L10/table1?GETtext/xml+votable180.050000true290.2191537.741161110.0055555555555555565/3688 6/14573 145753.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/729/L10?format=asciidefaultJ/ApJ/729/L10/table1Properties of stars in NGC 6791 and NGC 6819recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCCluster NGC number (6791 or 6819)meta.id.parentintKICKepler identification numbermeta.id;meta.mainintTeff[4007/4843] Effective temperatureKphys.temperature.effectiveintVmag[12.6/15.8] V band magnitude (1)magphot.mag;em.opt.VfloatDnuLarge frequency separationuHzem.freq;src.varfloate_DnuUncertainty in DnuuHzstat.errorfloatnumaxFrequency of maximum poweruHzem.freq;src.varfloate_numaxUncertainty in numaxuHzstat.errorfloatRadEstimated stellar radiussolRadphys.size.radiusfloatE_RadUpper limit uncertainty in RadsolRadstat.error;stat.maxfloate_RadLower limit uncertainty in RadsolRadstat.errorfloatMassEstimated stellar masssolMassphys.massfloatE_MassUpper limit uncertainty in MasssolMassstat.error;stat.maxfloate_MassLower limit uncertainty in MasssolMassstat.error;phys.massfloatlog(g)Log of estimated stellar surface gravitylog(cm.s**-2)phys.gravityfloatE_log(g)Upper limit uncertainty in log(g)log(cm.s**-2)stat.error;stat.maxfloate_log(g)Lower limit uncertainty in log(g)log(cm.s**-2)stat.errorfloatMoreStetson et al. data (2003, Cat. J/PASP/115/413) for NGC 6791, or Hole et al. data (2009, Cat. J/AJ/138/159) for NGC 6819meta.ref.urlchar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from Kepler Input Catalog (Cat. V/133) (right ascension part)degpos.eq.ra;meta.main_DEPositions from Kepler Input Catalog (Cat. V/133) (declination part)degpos.eq.dec;meta.main