J/A+A/604/A120ivo://CDS.VizieR/J/A+A/604/A120doi:10.26093/cds/vizier.36040120CDSNavarrete C.Catelan M.Contreras Ramos R.Alonso-Garcia J.Gran F.,Dekany I.Minniti D.2018-01-19T08:34:23Z2017-11-27T12:32:42ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsinfrared-photometryThe globular cluster {omega} Centauri (NGC 5139) hosts hundreds of pulsating variable stars of different types, thus representing a treasure trove for studies of their corresponding period-luminosity (PL) relations. Our goal in this study is to obtain the PL relations for RR Lyrae and SX Phoenicis stars in the field of the cluster, based on high-quality, well-sampled light curves in the near-infrared (IR). Observations were carried out using the VISTA InfraRed CAMera (VIRCAM) mounted on the Visible and Infrared Survey Telescope for Astronomy (VISTA). A total of 42 epochs in J and 100 epochs in K_S_ were obtained, spanning 352 days. Point-spread function photometry was performed using DoPhot and DAOPHOT crowded-field photometry packages in the outer and inner regions of the cluster, respectively. Based on the comprehensive catalog of near-IR light curves thus secured, PL relations were obtained for the different types of pulsators in the cluster, both in the J and K_S_ bands. This includes the first PL relations in the near-IR for fundamental-mode SX Phoenicis stars. The near-IR magnitudes and periods of Type II Cepheids and RR Lyrae stars were used to derive an updated true distance modulus to the cluster, with a resulting value of (m-M)_0_=13.708+/-0.035+/-0.10mag, where the error bars correspond to the adopted statistical and systematic errors, respectively. Adding the errors in quadrature, this is equivalent to a heliocentric distance of 5.52+/-0.27kpc.2017A&A...604A.120Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/604/A120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/105/145 : RR Lyr stars of ome Cen (Petersen 1994)J/A+AS/125/343 : OGLE RR Lyr stars in omega Cen (Kaluzny+ 1997)J/A+A/574/A15 : RR Lyrae in omega Cen (Fernandez-Trincado+, 2015)J/AJ/119/1824 : Caby photometry of {Omega} Centauri (Rey+, 2000)J/ApJ/640/L43 : Metallicities of RR Lyrae stars in Omega Cen (Sollima+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/604/A120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/604/A120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/604/A120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/604/A120https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/604/A120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/604/A120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/604/A120/tablea1 (Catalog of RR Lyrae stars in {omega} Cen field, used to derive the empirical PL relations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/604/A120/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/604/A120/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/604/A120/tablea1?GETtext/xml+votable180.050000true201.4839167-47.43172220.005555555555555556Cone search capability for table J/A+A/604/A120/tablea2 (Catalog of fundamental-mode candidate SX Phe stars in {omega} Cen, used to derive the empirical PL relations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/604/A120/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/604/A120/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/604/A120/tablea2?GETtext/xml+votable180.050000true201.9747917-47.53172220.0055555555555555566/43225 43227-43228 432308.643406281242892e-20 1.6978332528839141e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/604/A120?format=asciiInfrareddefaultJ/A+A/604/A120/tablea1Catalog of RR Lyrae stars in {omega} Cen field, used to derive the empirical PL relationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameStar identification (VNNN), Cl* NGC 5139 SAW VNNN in Simbadmeta.id;meta.maincharn_VName[abc] Note on VName (1)meta.notecharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainPerPerioddtime.perioddoubleJmagVISTA J magnitudemagphot.mag;em.IR.Jfloate_Jmagrms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatKsmagVISTA Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatTypeRR Lyrae typemeta.notechar[Fe/H]R00? Metallicity from Rey et al. (2000, Cat. J/AJ/119/1824)phys.abund.Fefloatnullablee_[Fe/H]R00? rms uncertainty on [Fe/H]R00phys.abund.Fefloatnullable[Fe/H]S06? Metallicity from Sollima et al. (2006, Cat.J/ApJ/640/L43)phys.abund.Fefloatnullablee_[Fe/H]S06? rms uncertainty on [Fe/H]S06phys.abund.FefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/604/A120/tablea2Catalog of fundamental-mode candidate SX Phe stars in {omega} Cen, used to derive the empirical PL relationsJmagVISTA J magnitudemagphot.mag;em.IR.Jfloate_Jmagrms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameStar identification (VNNN), Cl* NGC 5139 SAW VNNN in Simbadmeta.id;meta.maincharONameOther name (WNNN), Cl* NGC 5139 WSB VNNN in Simbadmeta.idcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainPerPerioddtime.perioddoubleKsmagVISTA Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatRem[1/2] Remarks (1)meta.noteintSimbadSimbad column added by the CDSmeta.ref.urlchar