J/AJ/149/99ivo://CDS.VizieR/J/AJ/149/99doi:10.26093/cds/vizier.51490099CDSAlonso-Garcia J.Dekany I.Catelan M.Ramos R.C.Gran F.Amigo P.,Leyton P.Minniti D.2017-11-06T12:23:56Z2015-04-14T12:25:14ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsstellar-distanceinfrared-photometryThe VISTA Variables in the Via Lactea (VVV) ESO Public Survey is opening a new window to study inner Galactic globular clusters (GCs) using their variable stars. These GCs have been neglected in the past due to the difficulties caused by the presence of elevated extinction and high field stellar densities in their lines of sight. However, the discovery and study of any present variables in these clusters, especially RR Lyrae stars, can help to greatly improve the accuracy of their physical parameters. It can also help to shed some light on the questions raised by the intriguing Oosterhoff dichotomy in the Galactic GC system. In a series of papers we plan to explore variable stars in the GCs falling inside the field of the VVV survey. In this first paper, we search for and study the variables present in two highly reddened, moderately metal-poor, faint, inner Galactic GCs: 2MASS-GC 02 and Terzan 10. We report the discovery of sizable populations of RR Lyrae stars in both GCs. We use near-infrared period-luminosity relations to determine the color excess of each RR Lyrae star, from which we obtain both accurate distances to the GCs and the ratios of the selective-to-total extinction in their directions. We find the extinction toward both clusters to be elevated, non-standard, and highly differential. We also find both clusters to be closer to the Galactic center than previously thought, with Terzan 10 being on the far side of the Galactic bulge. Finally, we discuss their Oosterhoff properties, and conclude that both clusters stand out from the dichotomy followed by most Galactic GCs.2015AJ....149...99Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/99CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/337 : VISTA Variables in the Via Lactea Survey DR1 (Minniti+, 2014)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/571/A36 : M dwarfs in b201 tile of VVV survey (Rojas-Ayala+, 2014)J/A+A/564/L9 : Near-IR photometry in VVV CL08 (Ramirez Alegria+, 2014)J/A+A/562/A115 : VVV: star formation and embedded clusters (Solin+, 2014)J/A+A/554/A123 : Near-IR catalog of novae in VVV survey area (Saito+, 2013)J/MNRAS/429/385 : Short-period variables near Galactic CentreJ/A+A/552/A74 : NIR photometry of Galactic PNe with VVV SurveyJ/AJ/144/127 : 204 galaxy candidates from VVV infrared photometryJ/AJ/143/70 : Differential reddening in MW globulars (Alonso-Garcia+, 2012)J/A+A/532/A131 : New Galactic star clusters in VVV survey (Borissova+, 2011)J/A+A/474/121 : Galactic globular cluster 2MASS GC02 JKs photometryJ/A+AS/126/319 : Terzan 10, ESO456-SC38, UKS 1 VIz photometry (Ortolani+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/99https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/99http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/99https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/99https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/99http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/99GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/149/99/table3 (Properties of the variable candidates in 2MASS-GC 02 and immediate surroundings)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/99/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/99/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/99/table3?GETtext/xml+votable180.050000true272.3999167-20.78655560.005555555555555556Cone search capability for table J/AJ/149/99/table6 (Properties of the variable candidates in Terzan 10 and immediate surroundings)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/99/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/99/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/99/table6?GETtext/xml+votable180.050000true270.7452917-26.05977780.0055555555555555566/28877 290907.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/99?format=asciiInfrareddefaultJ/AJ/149/99/table3Properties of the variable candidates in 2MASS-GC 02 and immediate surroundingsf_NV[*] Parameters light curve not well defined (1)meta.codecharLClight curvemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNV[1/160] Number of the New Variable candidatemeta.id;meta.mainintprimaryRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainDistDistance to the cluster centerarcminpos.angDistancefloatl_Per[>] Limit flag on Permeta.code.errorcharPer[0.1/500] Perioddtime.perioddoublef_Kamp[~] Approximate flag on Kampmeta.codecharKampAmplitude of variation in the Ks bandmagsrc.var.amplitude;em.IR.Kfloatf_<Ksmag>[~] Approximate flag on <Ksmag>meta.codechar<Ksmag>Mean Ks band magnitudemagstat.mean;phot.mag;em.IR.KfloatZ-Ks? The (Z-Ks) color index (2)magphot.color;em.IR;em.IRfloatnullableY-Ks? The (Y-Ks) color index (2)magphot.color;em.IR;em.IRfloatnullableJ-Ks? The (J-Ks) color index (2)magphot.color;em.IR.J;em.IR.KfloatnullableH-Ks? The (H-Ks) color index (2)magphot.color;em.IR.H;em.IR.KfloatnullableTypeVariable type (Ceph, Ecl, LPV, or RRab) (3)meta.code;src.varcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/149/99/figure2Light curves of the variable candidates in 2MASS-GC02 and surroundingsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNVNumber of the New Variable candidate (1)meta.id;meta.mainintHJDHeliocentric Julian Date (HJD-2400000.5)dtime.epochdoubleKsmagThe Ks band magnitudemagphot.mag;em.IR.Kfloate_KsmagUncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloatf_Ksmag[0/1] Observation flag on Ksmag (0=measure considered, 1=measure rejected) (2)meta.codeintJ/AJ/149/99/figure7Light curves of the variable candidates in Terzan 10recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNVNumber of the New Variable candidate (1)meta.id;meta.mainintHJDHeliocentric Julian Date (HJD-2400000.5)dtime.epochdoubleKsmagThe Ks band magnitudemagphot.mag;em.IR.Kfloate_KsmagUncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloatf_Ksmag[0/1] Observation flag on Ksmag (0=measure considered, 1=measure rejected) (2)meta.codeintJ/AJ/149/99/table6Properties of the variable candidates in Terzan 10 and immediate surroundingsl_Per[>] Limit flag on Permeta.code.errorcharPer[0.1/500] Perioddtime.perioddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNV[1/160] Number of the New Variable candidatemeta.id;meta.mainintf_NV[*] Parameters light curve not well defined (1)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainDistDistance to the cluster centerarcminpos.angDistancefloatf_Kamp[~] Approximate flag on Kampmeta.codecharKampAmplitude of variation in the Ks bandmagsrc.var.amplitude;em.IR.Kfloatf_<Ksmag>[~] Approximate flag on <Ksmag>meta.codechar<Ksmag>Mean Ks band magnitudemagstat.mean;phot.mag;em.IR.KfloatZ-Ks? The (Z-Ks) color index (2)magphot.color;em.IR;em.IRfloatnullableY-Ks? The (Y-Ks) color index (2)magphot.color;em.IR;em.IRfloatnullableJ-Ks? The (J-Ks) color index (2)magphot.color;em.IR.J;em.IR.KfloatnullableH-Ks? The (H-Ks) color index (2)magphot.color;em.IR.H;em.IR.KfloatnullableTypeVariable type (Ceph, Ecl, LPV, or RRab) (3)meta.code;src.varcharLClight curvemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar