J/A+A/573/A103ivo://CDS.VizieR/J/A+A/573/A103doi:10.26093/cds/vizier.35730103CDSSkottfelt J.Bramich D.M.Figuera Jaimes R.Jorgensen U.G.Kains N.,Arrellano Ferro A.Alsubai K.A.Bozza V.Calchi Novati S.Ciceri S.,D'Ago G.Dominik M.Galianni P.Gu S.H.Harpsoe K.B.W.Haugboelle T.,Hinse T.C.Hundertmark M.Juncher D.Korhonen H.Liebig C.Mancini L.,Popovas A.Rabus M.Rahvar S.Scarpetta G.Schmidt R.W.Southworth J.,Snodgrass C.Starkey D.Street R.A.Surdej J.Wang X.-B.Wertz O.(The MiNDSTEp consortium)2018-12-03T13:02:17Z2015-01-06T06:21:19ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsccd-photometryIn this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal rich ([Fe/H]>-1) globular clusters: NGC6388, NGC6441, NGC6528, NGC6638, and NGC6652. The data have been used to perform a census of the variable stars in the central parts of these clusters. The observations were made with the electron multiplying CCD (EMCCD) camera at the Danish 1.54m Telescope at La Silla, Chile, and they were analysed using difference image analysis (DIA) to obtain high-precision light curves of the variable stars. It was possible to identify and classify all of the previously known or suspected variable stars in the central regions of the five clusters. Furthermore, we were able to identify, and in most cases classify 48, 49, 7, 8, and 2 previously unknown variables in NGC 6388, NGC 6441, NGC 6528, NGC 6638, and NGC 6652, respectively. Especially interesting is the case of NGC 6441, for which the variable star population of about 150 stars has been thoroughly examined by previous studies, including a Hubble Space Telescope study. In this paper we are able to present 49 new variable stars for this cluster, of which one (possibly two) are RR Lyrae stars, two are W Virginis stars, and the rest are long period semi-regular or irregular variables on the red giant branch. We have also detected the first double mode RR Lyrae in the cluster.2015A&A...573A.103Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/573/A103CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/127/167 : Variable stars in NGC6638 (Rutily+ 1997)J/AJ/122/2600 : Variable stars in NGC6441 (Pritzl+ 2001)J/AJ/124/949 : Variable stars in NGC6388 (Pritzl+ 2002)J/AJ/126/1381 : HST snaphost study of NGC6441 (Pritzl+ 2003)J/AJ/132/1014 : Image-subtraction photom of NGC6388, NGC6441 (Corwin+ 2006)J/MNRAS/413/1275 : VrI light curves of NGC6981 variables (Bramich+, 2011)J/A+A/553/A111 : Two new variables in NGC6981 (Skottfelt+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/573/A103https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/573/A103http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/573/A103https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/573/A103https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/573/A103http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/573/A103GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/573/A103/table1 (Coordinates and physical parameters of the clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/573/A103/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/573/A103/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/573/A103/table1?GETtext/xml+votable180.050000true264.0717917-44.73550.005555555555555556Cone search capability for table J/A+A/573/A103/stars (Details of the variables in our field of view (tables 4-11 of the paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/573/A103/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/573/A103/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/573/A103/stars?GETtext/xml+votable180.050000true264.0638375-44.734061110.0055555555555555566/28705 28778 28962 42314 47866https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/573/A103?format=asciidefaultJ/A+A/573/A103/table1Coordinates and physical parameters of the clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCCluster NGC numbermeta.id.parentintprimaryNvNumber of variables in this clustermeta.numberintnullableRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.main[Fe/H][-1/-0.1] Metallicity of the cluster (1)log(Sun)phys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H]log(Sun)stat.error;phys.abund.Fefloatc[1.3/1.8] Central concentration (2)em.wl.centralfloatEpochEpoch of the reference image (JD)dtime.epochdoubleSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/573/A103/starsDetails of the variables in our field of view (tables 4-11 of the paper)VNameVariable name, VNNNmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCCluster NGC number \linkRole{cluster properties}meta.id.parentintn_VName[b-e] Alternative variable number (1)meta.notecharLCPlot of the light curvesmeta.ref.urlcharNpNumber of observations for this starmeta.numberintnullableRAJ2000Right ascension (J2000.0) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0) (2)pos.eq.dec;meta.mainEpoch? Epoch of maximum light (HJD-2450000)dtime.epochdoublenullablePer[0.1/250]? Period (2)dtime.perioddoublenullablen_Per[h] Per is not the fundamental period (1)meta.notechar<Imag>[11.7/19.6]? Mean I magnitudemagphot.mag;em.opt.IfloatnullableAmp? Amplitude found in our special i'+z' filter (3)magphot.mag;em.opt.IfloatnullableBl[i -] Blend (4)meta.codecharClassVariability classificationsrc.classcharn_Per1[g] Period from 2002 paper (1)meta.notecharPer1? Period from Pritzl et al. (2003AJ....126.1381P)dtime.perioddoublenullablel_Per2[~] Limit flag on Per2meta.code.errorcharPer2? Period from Corwin et al. (2006AJ....132.1014C)dtime.periodfloatnullablen_Per2[af] unusual period (1)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/573/A103/photomElectron Multiplying CCD (EMCCD) time-series i+z photometry for all confirmed variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCCluster NGC numbermeta.id.parentintVNameVariable name, VNNNmeta.id;meta.maincharHJDHeliocentric Julian date of observationdtime.epochdoublemag.s? Standard magnitudemagphot.mag;em.opt.Ifloatnullablemag.i? Instrumental magnitude (1)magphot.mag;em.opt.Ifloatnullablee_mag.i? Error on the magnitudemagstat.errorfloatnullableFrefReference flux (in ADU/s) (1)s**-1phot.flux.density;em.optdoublee_FrefError on the reference flux (in ADU/s)s**-1stat.errordoubleDFluxDifferential flux (in ADU/s)s**-1phot.flux;arith.ratiodoublee_DFluxError on the differential flux (in ADU/s)s**-1stat.errordoublepPhotometric scale factor (1)arith.factorfloat