J/MNRAS/424/2722ivo://CDS.VizieR/J/MNRAS/424/2722doi:10.26093/cds/vizier.74242722CDSBramich D.M.Arellano Ferro A.Figuera Jaimes R.Giridhar S.2024-07-18T20:18:55Z2013-02-01T16:07:33ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsphotometryWe have performed a careful investigation of the 74 candidate variable stars presented by Safonova & Stalin (2011AJ....142..179S) . For this purpose we used our data base of imaging and light curves from Arellano Ferro et al. (J/MNRAS/416/2265 and J/MNRAS/420/1333). We find that two candidates are known variable stars, eight candidates were discovered first by Arellano Ferro et al. (J/MNRAS/416/2265), but would not have been known to Safonova & Stalin (2011AJ....142..179S) at the time of their paper submission, while four candidates are new variables. Three of the new variables are SX Phe type and one is a semiregular (SR) type red giant variable. We also tentatively confirm the presence of true variability in two other candidates, and we are unable to investigate another four candidates because they are not in our data base. However, we find that the remaining 54 candidate variable stars are spurious detections where systematic trends in the light curves have been mistaken for true variability. We believe that the erroneous detections are caused by the adoption of a very low detection threshold used to identify these candidates.2012MNRAS.424.2722Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/424/2722CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/116/1775 : BV photometry of M53 (Rey+, 1998)J/PAZh/23/454 : Identification and coordinates in M 53 (Evstigneeva+, 1997)J/A+A/358/547 : M53 variable stars V light curves (Kopacki, 2000)J/A+A/507/803 : VI photometry of new M53 variables (Dekany+, 2009)J/MNRAS/416/2265 : Variable stars in NGC 5024 (M53) (Arellano Ferro+, 2011)J/MNRAS/420/1333 : Variable stars in NGC 5024 (M53) (Arellano Ferro+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/424/2722https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/424/2722http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/424/2722https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/424/2722https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/424/2722http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/424/2722GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/424/2722/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/424/2722/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/424/2722/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/424/2722/stars?GETtext/xml+votable180.050000true198.2542518.16930560.0055555555555555566/27975 27981https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/424/2722?format=asciiOpticaldefaultJ/MNRAS/424/2722/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable star Namemeta.id;meta.maincharprimaryLCShow the light curvesmeta.ref.urlcharRAJ2000Simbad Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Declination (J2000)pos.eq.dec;meta.mainPerPerioddtime.perioddoublen_Per[abc*] Reference for period (1)meta.notecharSimbadSimbad column added by the CDSmeta.refcharJ/MNRAS/424/2722/table2Time series V and I photometry for all the SX Phe and long-period variables in NGC 5024recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable star IDmeta.id;meta.maincharFilter[VI] Observation filterobs.param;obscharHJDHeliocentric Julian date at mid-exposuredtime.epochdoublemagstStandard magnitudemagphot.magfloatmaginstInstrumental magnitudemagphot.magfloate_maginstMagnitude uncertainty (standard or instrumental)magstat.errorfloatFrefReference flux (in ADU/s unit) (1)s**-1phot.flux.density;em.optdoublee_FrefReference flux uncertainty (in ADU/s unit)s**-1stat.errorfloatDFluxDifference flux (in ADU/s unit) (1)s**-1phot.flux;arith.ratiodoublee_DFluxDifference flux uncertainty (in ADU/s unit)s**-1stat.errorfloatpPhotometric scale factor (1)arith.factorfloat