J/ApJS/214/10ivo://CDS.VizieR/J/ApJS/214/10doi:10.26093/cds/vizier.22140010CDSBritt C.T.Hynes R.I.Johnson C.B.Baldwin A.Jonker P.G.Nelemans G.,Torres M.A.P.Maccarone T.Steeghs D.Greiss S.Heinke C.Bassa C.G.,Collazzi A.Villar A.Gabb M.Gossen L.2014-11-08T15:02:12Z2014-10-22T08:34:59ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomyphotometryvariable-starsx-ray-sourcessurveysWe present optical light curves of variable stars consistent with the positions of X-ray sources identified with the Chandra X-ray Observatory for the Chandra Galactic Bulge Survey (GBS). Using data from the Mosaic-II instrument on the Blanco 4m Telescope at CTIO, we gathered time-resolved photometric data on timescales from ~2hr to 8 days over the 3/4 of the X-ray survey containing sources from the initial GBS catalog. Among the light curve morphologies we identify are flickering in interacting binaries, eclipsing sources, dwarf nova outbursts, ellipsoidal variations, long period variables, spotted stars, and flare stars. Eighty-seven percent of X-ray sources have at least one potential optical counterpart. Twenty-seven percent of these candidate counterparts are detectably variable; a much greater fraction than expected for randomly selected field stars, which suggests that most of these variables are real counterparts. We discuss individual sources of interest, provide variability information on candidate counterparts, and discuss the characteristics of the variable population.2014ApJS..214...10Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/214/10CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)II/316 : UKIDSS-DR6 Galactic Plane Survey (Lucas+ 2012)J/ApJS/210/18 : X-ray survey of the Galactic Bulge (CXOGBS) (Jonker+, 2014)J/ApJ/761/162 : Tycho-2 stars in Galactic Bulge Survey (Hynes+, 2012)J/AcA/62/133 : Optical counterparts of X-ray sources in OGLE (Udalski+, 2012)J/AcA/61/285 : VI light curves of Galactic Bulge Cepheids (Soszynski+, 2011)J/AcA/61/1 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2011)J/ApJS/194/18 : The Galactic Bulge Survey: X-ray observations (Jonker+, 2011)J/ApJ/721/1663 : NIR matches of X-ray sources in Gal. Center (DeWitt+, 2010)J/ApJ/703/30 : NIR counterparts to Chandra X-ray sources. (Mauerhan+, 2009)J/ApJ/700/1702 : ChaMPlane deep galactic bulge survey. I. (van den Berg+, 2009)J/MNRAS/351/31 : XMM-Newton Galactic Plane Survey (XGPS) (Hands+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/214/10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/214/10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/214/10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/214/10https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/214/10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/214/10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/214/10/table2 (Each Galactic Bulge Survey (GBS) source with a likely variable optical counterpart)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/214/10/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/214/10/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/214/10/table2?GETtext/xml+votable180.050000true264.36832-29.133840.0055555555555555565/7212 7213 6/28818 28819 28822 28823 28825 28828 28829 28836 28837 28839 28872 28873 28896 28898https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/214/10?format=asciiX-rayOpticalInfrareddefaultJ/ApJS/214/10/table2Each Galactic Bulge Survey (GBS) source with a likely variable optical counterpartrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[JBN2011][2/1232] Chandra Catalog identifier (1)meta.id;meta.tableintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainr'mag[15.5/23.5] The r' band magnitudemagphot.mag;em.opt.Rfloate_r'mag[0.001/0.3] Average relative photometric error in r'magmagstat.error;phot.mag;em.opt.RfloatRMSRMS variation of lightcurvemagphot.magfloatSep[0.03/6.5] Distance to star from X-ray positionarcsecpos.angDistancefloatCR95[0.3/13] 95% confidence radius of X-ray positionarcsecphys.angSize;srcfloatLCLight curvemeta.ref.urlcharNphNumber of photometric measurements in table 3meta.numberintnullablelogx/o[-1.8/2] log of X-ray to optical fluxes without correcting for extinctionphot.flux;arith.ratiofloatE(B-V)[1/4.3] The (B-V) color excess (2)magphot.color.excessfloatlogxoc[-5.4/0.3] Corrected X-ray to optical flux (3)phot.flux;arith.ratiofloatHR[-1.2/1] X-ray hardness ratio (4)phot.flux;em.X-ray;arith.ratiofloatFAPFalse Alarm Probability (5)stat.fit.goodnessdoubleJ14Display the GBS data from Jonker+, 2014, J/ApJS/210/18meta.ref.urlcharJ/ApJS/214/10/table3Lightcurves of variable optical counterparts to GBS sourcesHJDHeliocentric Julian Datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[JBN2011][2/1232] Chandra Catalog identifiermeta.id;meta.tableintr'mag[15.3/26.2] The r' band magnitudemagphot.mag;em.opt.Rfloate_r'mag[0/2.5] Average relative photometric error in r'magmagstat.error;phot.mag;em.opt.Rfloat