J/AJ/145/7ivo://CDS.VizieR/J/AJ/145/7doi:10.26093/cds/vizier.51450007CDSJanes K.Barnes S.A.Meibom S.Hoq S.2018-02-01T11:50:43Z2014-02-21T14:28:03ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryccd-photometryNGC 6811 is one of the four open clusters located in the Kepler spacecraft field of view. We obtained UBVRI photometry of the cluster on six nights (four of them photometric) with the 1.08m Hall and 1.83m Perkins telescopes at Lowell Observatory. The mean photometric precision ranges from better than 0.01mag in the V, B-V, V-R, and V-I indices among stars brighter than magnitude 15 to about 0.05mag for U-B at magnitude 18. We followed a Bayesian statistical approach using the Markov Chain Monte Carlo algorithm to determine the cluster reddening, distance, age, and iron content from a maximum-likelihood fit to stellar isochrones. Using the Yale-Yonsei isochrones, we derived E(B-V)=0.066+/-0.025, (m-M)_V_=10.13+/-0.19, age=1.06+/-0.19Gyr, and Z=0.012+/-0.004 ([Fe/H]=-0.18); with the Padova isochrones, we found E(B-V)=0.081+/-0.015, (m-M)_V_=10.31+/-0.11, age=0.94+/-0.08Gyr, and Z=0.012+/-0.002 ([Fe/H]=-0.20). The uncertainties include possible errors in the photometric zero points of +/-0.01mag, but do not include uncertainties in the models. Taking into account the differences between the two sets of models, we find the best estimate for the cluster parameters to be E(B-V)=0.074+/-0.024, (m-M)_V_=10.22+/-0.18, age=1.00+/-0.17Gyr, and Z=0.012+/-0.004 ([Fe/H]=-0.19).2013AJ....145....7Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/145/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/other/RMxAA/47.309 : NGC 6811 & NGC 6830 uvby-{beta} photometry (Pena+, 2011)J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)J/ApJ/733/L9 : Stellar rotation for 71 NGC 6811 members (Meibom+, 2011)J/AJ/136/118 : Open clusters as galactic disk tracers. I. (Frinchaboy+, 2008)J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)J/PAZh/25/115 : A study of the open cluster NGC 6811 (Glushkova+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/145/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/145/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/145/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/145/7https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/145/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/145/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/145/7/table3 (Photometric catalog in NGC 6811)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/145/7/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/145/7/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/145/7/table3?GETtext/xml+votable180.050000true293.805288346.06014560.0055555555555555566/14779 14782 15120 15121 151243.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/145/7?format=asciiOpticalInfrareddefaultJ/AJ/145/7/table3Photometric catalog in NGC 6811recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[1/10674] Running star number (in RA order) <[JBM2013] NNNNN> in Simbadmeta.id;meta.mainintXpos[-1288/1753] X position (X={alpha}cos{delta}) (1)arcsecpos.cartesian.x;instr.detdoubleYpos[-1261.1/1853.01] Y position (Y={delta}) (1)arcsecpos.cartesian.y;instr.detdoubleVmag[10.37/22.891] The V band magnitudemagphot.mag;em.opt.Vfloate_VmagError in Vmagmagstat.error;phot.mag;em.opt.VfloatB-V[-0.232/1.851]? The (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? Error in B-Vmagstat.error;phot.color;em.opt.BfloatnullableU-B[-1.04/2.194]? The (U-B) color indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? Error in U-Bmagstat.error;phot.color;em.opt.UfloatnullableV-R[0.012/1.438]? The (V-R) colormagphot.color;em.opt.V;em.opt.Rfloatnullablee_V-R? Error in V-Rmagstat.error;phot.color;em.opt.VfloatnullableV-I[-0.141/3.192]? The (V-I) colormagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-I? Error in V-Imagstat.error;phot.color;em.opt.VfloatnullableNU[0/13] Number of U band framesmeta.numberintNB[0/25] Number of B band framesmeta.numberintNV[3/25] Number of V band framesmeta.numberintNR[0/6] Number of R band framesmeta.numberintNI[0/8] Number of I band framesmeta.numberint_RAPosition computed from a comparison with UCAC4 catalog (I/322) ({sigma}=0.39'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC4 catalog (I/322) ({sigma}=0.39'') (declination part)degpos.eq.dec;meta.main