J/MNRAS/468/2816ivo://CDS.VizieR/J/MNRAS/468/2816doi:10.26093/cds/vizier.74682816CDSMartinazzi E.Kepler S.O.Costa J.E.S.2024-08-17T20:18:40Z2020-04-06T12:49:53ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsapparent-magnitudeWe have conducted a photometric survey of the globular cluster NGC 6397 in a search for variable stars. We obtained ~11h of time-resolved photometric images with one European Southern Observatory-Very Large Telescope using the FOcal Reducer and low dispersion Spectrograph imager distributed over two consecutive nights. We analysed 8391 light curves of stars brighter than magnitude 23 with the 465-nm filter, and we identified 412 variable stars, reaching ~4.8+/-0.2 per cent of variability with time-scales between 0.004 and 2d, with amplitudes variation greater than +/-0.2mag.2017MNRAS.468.2816Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/468/2816CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/527/A148 : NGC6397 red giants chemical composition (Lind+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/468/2816https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/468/2816http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/468/2816https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/468/2816https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/468/2816http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/468/2816GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/468/2816/tablea1 (Variable stars in NGC 6397 with 99.9 per cent confidence level)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/468/2816/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/468/2816/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/468/2816/tablea1?GETtext/xml+votable180.050000true265.1975833-53.7532250.0055555555555555566/420764.271926443021129e-19 4.271926443021129e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/468/2816?format=asciidefaultJ/MNRAS/468/2816/tablea1Variable stars in NGC 6397 with 99.9 per cent confidence levelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designation, N/NNNNmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainchi2rReduced chi^2^ valuestat.fit.chi2floatF465-250Filt_465_250 magnitude (central wavelength = 4650{AA}, dl=250{AA})magphot.mag;em.UVfloatBmagHIGH B magnitudemagphot.mag;em.opt.Bfloate_BmagHIGH B magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagHIGH V magnitudemagphot.mag;em.opt.Vfloate_VmagHIGH V magnitude errormagstat.error;phot.mag;em.opt.Vfloat