J/A+A/555/A36ivo://CDS.VizieR/J/A+A/555/A36doi:10.26093/cds/vizier.35550036CDSKains N.Bramich D.M.Arellano Ferro A.Figuera Jaimes R.,Jorgensen U.G.Giridhar S.Alsubai K.A.Andersen J.M.Bozza V.,Browne P.Burgdorf M.Calchi Novati S.Damerdji Y.Diehl C.Dodds P.,Dominik M.Elyiv A.Fang X.-S.Giannini E.Gu S.-H.Hardis S.,Harpsoe K.Hinse T.C.Hornstrup A.Hundertmark M.Jessen-Hansen J.,Juncher D.Kerins E.Kjeldsen H.Korhonen H.Liebig C.Lund M.N.,Lundkvist M.Mancini L.Martin R.Mathiasen M.Penny M.T.Rabus M.,Rahvar S.Ricci D.Sahu K.Scarpetta G.Skottfelt J.Snodgrass C.,Southworth J.Surdej J.Tregloan-Reed J.Vilela C.Wertz O.Williams A.(The MiNDSTEp consortium)2017-10-02T19:28:29Z2013-06-26T08:48:56ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsccd-photometryWe present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M 30 (NGC 7099). We used our data to search for variable stars in this cluster and refine the periods of known variables; we then used our variable star light curves to derive values for the cluster's parameters. We used difference image analysis to reduce our data to obtain high-precision light curves of variable stars. We then estimated the cluster parameters by performing a Fourier decomposition of the light curves of RR Lyrae stars for which a good period estimate was possible. We also derive an estimate for the age of the cluster by fitting theoretical isochrones to our colour-magnitude diagram (CMD). Out of 13 stars previously catalogued as variables, we find that only 4 are bona fide variables. We detect two new RR Lyrae variables, and confirm two additional RR Lyrae candidates from the literature. We also detect four other new variables, including an eclipsing blue straggler system, and an SX Phoenicis star. This amounts to a total number of confirmed variable stars in M 30 of 12. We perform Fourier decomposition of the light curves of the RR Lyrae stars to derive cluster parameters using empirical relations. We find a cluster metallicity [Fe/H]_ZW_=-2.01+/-0.04, or [Fe/H]_UVES_=-2.11+/-0.06, and a distance of 8.32+/-0.20kpc (using RR0 variables), 8.10 kpc (using one RR1 variable), and 8.35+/-0.42kpc (using our SX Phoenicis star detection in M 30). Fitting isochrones to the CMD, we estimate an age of 13.0+/-1.0Gyr for M 30.2013A&A...555A..36Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/555/A36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/other/MmSAI/20.63 : M30 V1-V3 variable light curves (Rosino, 1949)J/A+A/313/129 : M30 blue stars positions and magnitudes (Burgarella+ 1996)J/AJ/116/1757 : M30 UBV photometry (Guhathakurta+, 1998)J/ApJ/518/262 : CCD VIc Photometry of M30 stars (Sandquist+, 1999)J/ApJ/657/286 : Chandra X-ray sources in M30 (NGC 7099) (Lugger+, 2007)J/MNRAS/413/1275 : VrI light curves of NGC6981 variables (Bramich+, 2011)J/A+A/548/A92 : VrI light curves of NGC1904 variables (Kains+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/555/A36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/555/A36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/555/A36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/555/A36https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/555/A36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/555/A36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/555/A36/stars (Data for all confirmed variable stars in NGC7099 (tables 3 and 5 of the paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/555/A36/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/555/A36/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/555/A36/stars?GETtext/xml+votable180.050000true325.1010417-23.19622220.0055555555555555566/48434https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/555/A36?format=asciidefaultJ/A+A/555/A36/starsData for all confirmed variable stars in NGC7099 (tables 3 and 5 of the paper)LCPlot of the light curvesmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable name, VNN, <Cl* NGC 7099 SAW VNN> in Simbadmeta.id;meta.maincharprimaryn_VName[bc] Individual notes on variables (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainEpEpoch (HJD-2450000)dtime.epochdoublePerPerioddtime.perioddoublePer1? Rosino (1949, J/other/MmSAI/20.63) perioddtime.perioddoublenullablen_Per1[a] Note on Per1 (2)meta.notecharPer2? Pietrukowicz et al. (2004AcA....54...19P) period (3)dtime.periodfloatnullable<Vmag>Mean V magnitude (4)magphot.mag;em.opt.Vfloat<Imag>? Mean I magnitude (4)magphot.mag;em.opt.Ifloatnullablel_Vamp[~] Limit flag on Vampmeta.code.errorcharVampAmplitude in V bandmagphot.mag;em.opt.VfloatIamp? Amplitude in I bandmagphot.mag;em.opt.IfloatnullableVTypeVariable typemeta.code;src.varcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/555/A36/table2V and I lightcurvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable name, VNNmeta.id;meta.maincharFilter[VI] Observation filterobs.param;obscharHJDHeliocentric Julian datedtime.epochdoublemag.sStandard magnitudemagphot.magfloatmag.iInstrumental magnitudemagphot.magfloate_mag.iError on the magnitudemagstat.errorfloatFrefReference flux (in ADU/s)s**-1phot.flux.density;em.optdoublee_FrefError on the reference flux (in ADU/s)s**-1stat.errorfloatDFluxDifferential flux (in ADU/s)s**-1phot.flux;arith.ratiodoublee_DFluxError on the differential flux (in ADU/s)s**-1stat.errorfloatpPhotometric scale factorarith.factorfloat