J/AJ/152/170ivo://CDS.VizieR/J/AJ/152/170doi:10.26093/cds/vizier.51520170CDSBraga V.F.Stetson P.B.Bono G.Dall'Ora M.Ferraro I.Fiorentino G.,Freyhammer L.M.Iannicola G.Marengo M.Neeley J.Valenti E.,Buonanno R.Calamida A.Castellani M.da Silva R.Degl'Innocenti S.,Di Cecco A.Fabrizio M.Freedman W.L.Giuffrida G.Lub J.Madore B.F.,Marconi M.Marinoni S.Matsunaga N.Monelli M.Persson S.E.,Piersimoni A.M.Pietrinferni A.Prada-Moroni P.Pulone L.,Stellingwerf R.Tognelli E.Walker A.R.2019-12-27T04:38:40Z2018-03-28T10:38:21ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsinfrared-photometryvisible-astronomybroad-band-photometrymetallicityNew accurate and homogeneous optical UBVRI photometry has been obtained for variable stars in the Galactic globular cluster {omega} Cen (NGC 5139). We secured 8202 CCD images covering a time interval of 24 years and a sky area of 84x48arcmin. The current data were complemented with data available in the literature and provided new, homogeneous pulsation parameters (mean magnitudes, luminosity amplitudes, periods) for 187 candidate {omega} Cen RR Lyrae (RRLs). Among them we have 101 RRc (first overtone) and 85 RRab (fundamental) variables, and a single candidate RRd (double-mode) variable. Candidate Blazhko RRLs show periods and colors that are intermediate between the RRc and RRab variables, suggesting that they are transitional objects. A comparison of the period distribution and the Bailey diagram indicates that RRLs in {omega} Cen show a long-period tail not present in typical Oosterhoff II (OoII) globulars. The RRLs in dwarf spheroidals and in ultra-faint dwarfs have properties between Oosterhoff intermediate and OoII clusters. Metallicity plays a key role in shaping the above evidence. These findings do not support the hypothesis that {omega} Cen is the core remnant of a spoiled dwarf galaxy. Using optical period-Wesenheit relations that are reddening-free and minimally dependent on metallicity we find a mean distance to {omega} Cen of 13.71+/-0.08+/-0.01mag (semi-empirical and theoretical calibrations). Finally, we invert the I-band period-luminosity-metallicity relation to estimate individual RRLs' metal abundances. The metallicity distribution agrees quite well with spectroscopic and photometric metallicity estimates available in the literature.2016AJ....152..170Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/170CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/576/A30 : Light-curve templates for classical Cepheids (Inno+, 2015)J/A+A/583/A76 : Om. Cen candidates RAVE-selected (Fernandez-Trincado+, 2015)J/A+A/574/A15 : RR Lyrae in omega Cen (Fernandez-Trincado+, 2015)J/ApJS/219/25 : Light curves of RR Lyrae stars in M3 (Jurcsik+, 2015)J/PASP/126/521 : UBVRIJHK photometry of RR Lyrae in M4 (Stetson+, 2014)J/MNRAS/419/2173 : Long-term photometry of M3 RR Lyrae (Jursik+, 2012)J/A+A/547/A109 : Parameters of HB stars in {omega} Cen (Moni Bidin+, 2012)J/ApJ/722/1373 : {omega} Centauri giants abundances (Johnson+, 2010)J/A+A/505/117 : Abundances of red giants in 15 globulars (Carretta+, 2009)J/A+A/493/959 : UBV(RI)cHalpha photometry in omega Cen (Bellini+, 2009)J/ApJ/706/1277 : Stromgren photometry in {omega} Cen (Calamida+, 2009)J/ApJ/698/2048 : Abundances of red giants in {omega} Cen (Johnson+, 2009)J/AJ/136/506 : Radial velocities of {omega} Cen members (Da Costa+, 2008)J/AJ/133/1447 : Light curves of variables in {omega} Cen (Weldrake+, 2007)J/ApJ/663/1021 : Log of {omega} Cen scientific images (Castellani+, 2007)J/ApJ/640/L43 : Metallicities of RRL stars in Omega Cen (Sollima+, 2006)J/A+A/424/1101 : Variable Stars in the field of {omega} Cen (Kaluzny+, 2004)J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003)J/A+A/360/472 : Proper motions in omega Centauri (van Leeuwen+, 2000)J/AJ/119/1824 : Caby photometry of {omega} Centauri (Rey+, 2000)J/A+AS/125/343 : RR Lyr stars in omega Cen (Kaluzny+ 1997)J/ApJ/462/241 : Ca abundance for Omega Cen red giants (Norris+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/152/170https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/152/170http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/152/170https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/152/170https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/152/170http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/152/170GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/152/170/table23 (Positions and periods (table 2) and optical-UBVRI-mean magnitudes and amplitudes (table 3) for {omega} Cen RR Lyrae (RRLs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/170/table23?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/170/table23?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/170/table23?GETtext/xml+votable180.050000true201.484-47.43172220.0055555555555555566/43224 43225 43227 43228 43230 43249https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/152/170?format=asciiOpticalInfrareddefaultJ/AJ/152/170/table23Positions and periods (table 2) and optical-UBVRI-mean magnitudes and amplitudes (table 3) for {omega} Cen RR Lyrae (RRLs)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the {omega} Cen RR Lyraemeta.id;meta.maincharprimaryf_NameFlag on Name (e, f, or h) (1)meta.codecharMindicates Metallicity (table10)meta.ref.urlcharNIndicates a Notemeta.ref.urlcharRAJ2000Hour of Right Ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (2)pos.eq.dec;meta.mainPer1[0.25/1.1]? Pulsation period based on a compilation of literature values (Clement et al. 2001AJ....122.2587C) (3)dtime.perioddoublenullablePer2[0.25/1.1]? Pulsation period based on the current estimate using the Lomb-Scargle (LS) method (Scargle 1982ApJ...263..835S)dtime.perioddoublenullableBand1[BVRI] Band used for the epoch of light maximum (T_0_(max)) (B, V, R, or I)instr.bandpasscharHJD1[49113.5/54273.5]? Epoch of light maximum (T_0_(max)) in Heliocentric Julian Date (HJD-2400000) (4)dtime.epochdoublenullableBand2[BVRI] Band used for the epoch of mean magnitude on the rising branch (T_0_(rising)) (B, V, R, or I)instr.bandpasscharHJD2[49082.5/451270]? Epoch of mean magnitude on the rising branch (T_0_(rising)) in Heliocentric Julian Date (HJD-2400000) (4)dtime.epochdoublenullable<Umag>[14.67/15.81]? Mean U-band magnitude (1)magphot.mag;em.opt.Ufloatnullablee_<Umag>[0.009/0.43]? Error in Umag (2)magstat.error;phot.mag;em.opt.Ufloatnullable<Bmag>[14.59/15.5]? Mean B-band magnitude (1)magphot.mag;em.opt.Bfloatnullablee_<Bmag>[0.003/0.21]? Error in Bmag (2)magstat.error;phot.mag;em.opt.Bfloatnullable<Vmag>[14/18.2]? Mean V-band magnitude (1)magphot.mag;em.opt.Vfloatnullablee_<Vmag>[0.003/0.14]? Error in Vmag (2)magstat.error;phot.mag;em.opt.Vfloatnullable<Rmag>[12.36/15.43]? Mean R-band magnitude (1)magphot.mag;em.opt.Rfloatnullablee_<Rmag>[0.008/0.28]? Error in Rmag (2)magstat.error;phot.mag;em.opt.Rfloatnullable<Imag>[13.3/14.6]? Mean I-mag magnitude (1)magphot.mag;em.opt.Ifloatnullablee_<Imag>[0.007/0.18]? Error in Imag (2)magstat.error;phot.mag;em.opt.IfloatnullableAU[0.2/1.6]? Luminosity amplitude in U (3)magsrc.var.amplitudefloatnullableAB0[0.039/1.54]? Luminosity amplitude in B (or lower range) (3)magsrc.var.amplitudefloatnullableAB1[0.27/1.7]? Upper range of luminosity amplitude in B (3)magsrc.var.amplitudefloatnullableAV0[0.04/1.4]? Luminosity amplitude in V (or lower range) (3)magsrc.var.amplitudefloatnullableAV1[0.13/1.3]? Upper range of luminosity amplitude in V (3)magsrc.var.amplitudefloatnullableAR[0.024/1.12]? Luminosity amplitude in R (3)magsrc.var.amplitudefloatnullableAI[0.04/0.91]? Luminosity amplitude in I (3)magsrc.var.amplitudefloatnullableqU[0/2]? Photometric quality index of the U-band light curve (q_U_) (4)meta.code.qualintnullableqB[0/3]? Photometric quality index of the B-band light curve (q_B_) (4)meta.code.qualintnullableqV[0/3]? Photometric quality index of the V-band light curve (q_V_) (4)meta.code.qualintnullableqR[0/3]? Photometric quality index of the R-band light curve (q_R_) (4)meta.code.qualintnullableqI[0/3]? Photometric quality index of the I-band light curve (q_I_) (4)meta.code.qualintnullableModePulsation mode identification (RRab, RRc, or RRd) (5)em.freqcharf_Mode[*] An asterisk flag on Mode indicates that the variable is candidate Blazhko RR Lyraemeta.codecharJ/AJ/152/170/table10Metallicity estimates ([Fe/H]) of candidate {omega} Cen RR Lyrae (RRLs) based on spectroscopy (Sollima et al. 2006, Cat. J/ApJ/640/L43) and on photometric indices (Rey et al. 2000, Cat. J/AJ/119/1824, ours)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the candidate {omega} Cen RR Lyraemeta.id;meta.maincharS06[-2.2/-1.11]? Spectroscopic iron abundance provided by Sollima et al. 2006 (Cat. J/ApJ/640/L43)log(Sun)phys.abund.Fefloatnullablee_S06[0/1]? Error in S06log(Sun)stat.errorfloatnullableRey[-2.21/-0.9]? Metallicity estimate provided by Rey et al. 2000 (Cat. J/AJ/119/1824) (1)log(Sun)phys.abund.Fefloatnullablee_Rey[0.01/0.55]? Error in Reylog(Sun)stat.errorfloatnullableS06+Rey[-2.33/-1.02]? Mean iron abundance based on Sollima et al. 2006 (Cat. J/ApJ/640/L43) and Rey et al. 2000 (Cat. J/AJ/119/1824) abundances (2)log(Sun)phys.abund.Fefloatnullablee_S06+Rey[0/1]? Error in S06+Reylog(Sun)stat.errorfloatnullablePLI[-3/-0.52]? Iron abundance based on the inversion of the I-band PLZ relations for RRab and RRc variables (3)log(Sun)phys.abund.FefloatnullableS06+Rey+PLI[-3/-1.16] Mean iron abundance based on Sollima et al. 2006 (Cat. J/ApJ/640/L43), Rey et al. 2000 (Cat. J/AJ/119/1824) and on the current estimates (4)log(Sun)phys.abund.Fefloate_S06+Rey+PLI[0/0.8] Error in S06+Rey+PLIlog(Sun)stat.errorfloatJ/AJ/152/170/notesNotesNoteNotes about the starmeta.notecharNameName of the {omega} Cen RR Lyraemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint