J/AcA/63/429ivo://CDS.VizieR/J/AcA/63/429doi:10.26093/cds/vizier.120630429CDSArellano Ferro A,Bramich D.M.Giridhar S.Figuera Jaimes R.Kains N.,Kuppuswamy K.2025-09-25T20:16:02Z2014-01-15T12:04:53ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsccd-photometryA search for variable stars in the globular cluster NGC 288 was carried out using a time-series of CCD images in the V and I filters. The photometry of all stellar sources in the field of view of our images, down to V~19mag, was performed using difference image analysis (DIA). For stars of~15mag, measurement accuracies of ~8mmag and ~10mmag were achieved for V and I respectively. Three independent search strategies were applied to the 5525 light curves but no new variables were found above the threshold limits characteristic of our data set. The use of older data from the literature combined with the present data allowed the refinement of the periods of all known variables. Fourier light curve decomposition was performed for the RRab and the RRc stars to obtain an estimate of [Fe/H]_ZW_=-1.62+/-0.02 (statistical) +/-0.14 (systematic). A true distance modulus of 14.768+/-0.003mag (statistical) +/-0.042mag (systematic), or a distance of 8.99+/-0.01kpc (statistical) +/-0.17kpc (systematic) was calculated from the RRab star. The RRc star predicts a discrepant distance about one kiloparsec shorter but it is possibly a Blazhko variable. An independent distance from the P-L relationship for SX Phe stars leads to a distance of 8.9+/-0.3kpc. The SX Phe stars V5 and V9 are found to be double mode pulsators.2013AcA....63..429Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AcA/63/429CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/125/337 : New variables in NGC 288 (Kaluzny+ 1997)J/AJ/106/1024 : BV photometry in NGC 288 (Bergbusch 1993)J/AJ/122/2569 : VI photometry of NGC 288, 362 and 1851 (Bellazzini+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AcA/63/429https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AcA/63/429http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AcA/63/429https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AcA/63/429https://vizier.iucaa.in/viz-bin/votable?-source=J/AcA/63/429http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AcA/63/429GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AcA/63/429/table3 (General data for all of the confirmed variables in NGC 288 in the FoV of our images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/63/429/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/63/429/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/63/429/table3?GETtext/xml+votable180.050000true13.171375-26.55750.0055555555555555566/166472.367228618189496e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AcA/63/429?format=asciiOpticaldefaultJ/AcA/63/429/table3General data for all of the confirmed variables in NGC 288 in the FoV of our imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlcPlot of the light curvesmeta.ref.urlcharNameVariable name <Cl* NGC 288 Saw VNN> in Simbadmeta.id;meta.maincharTypeVariable type (RRab/c, SR, SX Phe or E)src.classcharVmagJohnson V magnitudemagphot.mag;em.opt.VfloatImag? Cousins I magnitudemagphot.mag;em.opt.Ifloatnullablel_AV[~] Limit flag on AVmeta.code.errorcharAVAmplitude in V bandmagsrc.var.amplitudefloatl_AI[~] Limit flag on AImeta.code.errorcharAI? Amplitude in I bandmagsrc.var.amplitudefloatnullablePer? Period from this paperdtime.perioddoublenullableHJDmaxDate of maximum (HJD-2450000)dtime.epochdoublen_HJDmax[b] b: HJDmax contains time of minimum lightmeta.notecharPerlPeriod from literaturedtime.perioddoublen_Per[a] a: Period from Oosterhoff (1943BAN.....9..397O)meta.notecharRAJ2000Right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.refcharJ/AcA/63/429/table2VI CCD photometry of variable stars in NGC 288Flt[VI] Filtermeta.id;instr.filtercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable star number, VNNmeta.id;meta.maincharHJDHeliocentric Julian daydtime.epoch;pos.heliocentricdoublemagstdStandard magnitudemagphot.magfloatmaginstInstrumental magnitudemagphot.magfloate_magstdError 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