J/AJ/152/129ivo://CDS.VizieR/J/AJ/152/129doi:10.26093/cds/vizier.51520129CDSChen X.Deng L.de Grijs R.Zhang X.Xin Y.Wang K.Luo C.Yan Z.,Tian J.Sun J.Liu Q.Zhou Q.Luo Z.2017-02-20T07:27:40Z2017-01-10T12:29:40ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomyphotometryradial-velocityproper-motionsWe used the newly commissioned 50cm Binocular Network telescope at Qinghai Station of Purple Mountain Observatory (Chinese Academy of Sciences) to observe the old open cluster NGC188 in V and R as part of a search for variable objects. Our time-series data span a total of 36 days. Radial velocity and proper-motion selection resulted in a sample of 532 genuine cluster members. Isochrone fitting was applied to the cleaned cluster sequence, yielding a distance modulus of (m-M)_V_^0^=11.35+/-0.10mag and a total foreground reddening of E(V-R)=0.062+/-0.002mag. Light-curve solutions were obtained for eight W Ursae Majoris eclipsing binary systems (W UMas), and their orbital parameters were estimated. Using the latter parameters, we estimate a distance to the W UMas that is independent of the host cluster's physical properties. Based on combined fits to six of the W UMas (EP Cep, EQ Cep, ES Cep, V369 Cep, and-for the first time-V370 Cep and V782 Cep), we obtain an average distance modulus of (m-M)_V_^0^=11.31+/-0.08mag, which is comparable to that resulting from our isochrone fits. These six W UMas exhibit an obvious period-luminosity relation. We derive more accurate physical parameters for the W UMa systems and discuss their initial masses and ages. The former show that these W UMa systems have likely undergone angular momentum evolution within a convective envelope (W-type evolution). The ages of the W UMa systems agree well with the cluster's age.2016AJ....152..129Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/129CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)J/AJ/147/42 : V light curves of EP Cep, ES Cep, and V369 Cep (Zhu+, 2014)J/AJ/137/5086 : NGC 188 V12 VI light curves (Meibom+, 2009)J/AJ/137/3743 : Spectroscopic binary orbits in NGC 188 (Geller+, 2009)J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008)J/AJ/133/1409 : u'g'r'i'z' photometry in NGC 188 (Fornal+, 2007)J/AJ/131/1565 : UBVI photometry of Berkeley 17 and NGC 188 (Krusberg+, 2006)J/A+A/438/291 : X-ray sources in NGC 188 (Gondoin+, 2005)J/PASP/116/1012 : A star catalog for the open cluster NGC 188 (Stetson+, 2004)J/AJ/126/2922 : Astrometry and membership in NGC 188 (Platais+, 2003)J/AJ/124/601 : Positions and proper motions in NGC 188 (Platais+, 2002)J/A+A/390/961 : VI photometry in NGC 188 (Andreuzzi+, 2002)J/AJ/118/2894 : UBVRI CCD photometry in NGC 188 (Sarajedini+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/152/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/152/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/152/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/152/129https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/152/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/152/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/152/129/table2 (Information for stars in the open cluster NGC 188 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/129/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/129/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/129/table2?GETtext/xml+votable180.050000true11.987885.24890.0055555555555555566/4076 40782.762881831355591e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/152/129?format=asciiInfraredOpticaldefaultJ/AJ/152/129/table2Information for stars in the open cluster NGC 188 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmag[11.8/19.2] Johnson V band magnitude (1)magphot.mag;em.opt.Vfloate_Vmag[0.0025/0.22] Uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatRmag[11.37/18.31] Cousins R band magnitude (1)magphot.mag;em.opt.Rfloate_Rmag[0.0023/0.22] Uncertainty in Rmagmagstat.error;phot.mag;em.opt.RfloatpmRA[-28.2/48.3] Proper motion along RA (2)mas/yrpos.pm;pos.eq.rafloatpmDE[-27/50.8] Proper motion along DE (2)mas/yrpos.pm;pos.eq.decfloatRV[-306.7/45.4]? Radial velocity (3)km/sphys.veloc;pos.heliocentricfloatnullableMm[0/1] Membership code (1=cluster member, or 0=not a cluster member)meta.code.memberint