J/A+A/556/A20ivo://CDS.VizieR/J/A+A/556/A20doi:10.26093/cds/vizier.35560020CDSFiguera Jaimes R.Arellano Ferro A.Bramich D.M.Giridhar S.,Kuppuswamy K.2018-01-30T07:18:24Z2013-07-19T15:57:13ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsinfrared-photometryvisible-astronomyphotometryWe have performed a photometric V,R,I CCD time-series analysis with a baseline of about eight years of the outer-halo globular cluster NGC 7492 with the aim of searching for new variables and using these (and the previously known variables) to determine the physical parameters of interest for the cluster (e.g. metallicity, absolute magnitude of the horizontal branch, distance, etc.). We used difference image analysis to extract precise light curves in the relatively crowded star field, especially towards the densely populated central region. Several different approaches were used for variability detection that recover the known variables and lead to new discoveries. We determined the physical parameters of the only RR0 star using a light-curve Fourier decomposition analysis. We found one new long-period variable and two SX Phe stars in the blue straggler region. We also present one candidate SX Phe star that requires follow-up observations.2013A&A...556A..20Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/556/A20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/151 : Structure Parameters of Galactic Globular Clusters (Webbink 1985)II/37 : UBV HR Diagrams of Globular Clusters (Philip+ 1976)J/MNRAS/419/342 : SX Phe stars in globular clusters (Cohen+, 2012)J/MNRAS/416/2265 : Variable stars in NGC 5024 (M53) (Arellano Ferro+, 2011)J/MNRAS/402/226 : NGC 5053 variables VrI light curves (Arellano Ferro+, 2010)J/MNRAS/396/1075 : Properties of Galactic globular clusters (Georgiev+, 2009)J/ApJ/682/1217 : Red giants abundances in 7 globular clusters (Kirby+, 2008)J/A+A/476/307 : Period variations in galactic RRab stars (Le Borgne+, 2007)J/AJ/129/1607 : Equivalent widths of 4 RGB in NGC 7492 (Cohen+, 2005)J/other/RMxAA/40.209 : VR light curves of RR Lyrae in NGC4147 (Arellano+, 2004)J/ApJ/590/797 : Parameters of galactic GCs (Van Den Bregh+, 2003)J/A+AS/67/327 : CCD photometry in NGC 7492 (Buonanno+, 1987)J/MNRAS/122/363 : Eggen PV photometry in NGC 7492 (Cuffey, 1961)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/556/A20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/556/A20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/556/A20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/556/A20https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/556/A20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/556/A20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/556/A20/table2 (*Celestial coordinates for all of the confirmed and candidate variables in our field of view)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/556/A20/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/556/A20/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/556/A20/table2?GETtext/xml+votable180.050000true347.1111667-15.58291670.0055555555555555566/171213.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/556/A20?format=asciiOpticalInfrareddefaultJ/A+A/556/A20/table3Time series V, R and I photometry for all the RR Lyrae, long-period, SX Phe variables and candidates in NGC 7492recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable star ID (V1, V2, V4-V7, CSX1)meta.id;meta.maincharprimaryFilt[VRI] Observation filter (V, R or I)phot.flux.density;em.optcharHJDHeliocentric Julian date at mid-exposuredtime.epochdoublemagst[12.83/19.78] Standard magnitudemagphot.magfloatmaginst[13.89/20.40]Instrumental magnitudemagphot.magfloate_maginst[0.001/0.134] Magnitude uncertainty (standard or instrumental)magstat.errorfloatFref[89.5/27399.2] Reference flux (in ADU/s unit) (1)s**-1phot.flux.density;em.optdoublee_FrefReference flux uncertainty (in ADU/s unit)s**-1stat.errorfloatDFlux[-1939/348] Difference flux (in ADU/s unit) (1)s**-1phot.flux.density;em.optdoublee_DFluxDifference flux uncertainty (in ADU/s unit)s**-1stat.errorfloatp[0.14/1.021] Photometric scale factor (1)arith.factorfloatJ/A+A/556/A20/table2*Celestial coordinates for all of the confirmed and candidate variables in our field of viewLCPlot of the light curvesmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable name (V1, V2, V4-V7, CSX1)meta.id;meta.maincharprimaryOTypeVariable type (RR0, RR1, LPV or SX Phe)src.classcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainT0? JD epoch of maximumdtime.epoch;stat.maxdoublenullableu_Per[~] Uncertainty flag on Permeta.code.errorcharPer? Perioddtime.perioddoublenullablef_Per[a] Period change (1)meta.codecharVmagMean V-band magnitudemagphot.mag;em.opt.Vfloatf_Vmag[bc] Intensity-weighted or mean magnitude (1)meta.codecharV-R? V-R color indexmagphot.color;em.opt.V;em.opt.Rfloatnullablef_V-R[bc] Intensity-weighted or mean color (1)meta.codecharl_Vamp[>~] Limit flag on VAmpmeta.code.errorcharVampV-band full amplitudemagphot.mag;em.opt.VfloatRamp? R-band full amplitudemagphot.mag;em.opt.Rfloatnullableu_Ramp[?] Uncertainty flag on Rampmeta.code.errorchar