J/AJ/166/95ivo://CDS.VizieR/J/AJ/166/95doi:10.26093/cds/vizier.51660095CDSCortes C.C.Llancaqueo Albornoz A.Villanova S.Ahumada J.A.,Parisi C.2024-11-06T20:19:13Z2024-04-05T07:42:51ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starsvariable-starsinfrared-photometryvisible-astronomyphotometryWe present the analysis of 510 light curves in V and I bands of 255 giant stars in the globular cluster NGC-3201. Our aim is to expand the sample of new types of variables reported in a previous study. These variables show a short period (PV<0.6day) and a low amplitude (AV<0.06mag.). We first searched for variability using the generalized Lomb-Scargle and phase dispersion minimization periodograms of the sample, discarding 167 stars as non-variables. We then applied the significance test and reduced the sample to 88 giants, of which we classified 18 as possible variables, 11 as dubious, 41 as non-variables, and 18 as variables. We finally determined the cluster membership of this sample and grouped each star based on their light-curve shape. The discovered variables show periods in the range 0.2440<PV<0.5868days and amplitudes between 0.010<AV<0.064 mag. Within the sample of 18 variable stars, we report the discovery of an object with a period PV=0.3603{+/-}0.0012 and amplitude AV=0.703{+/-}0.029 mag that shows a RR-Lyrae ab-type light curve. Additionally, we report two RR-Lyrae ab and c types with ultralow amplitude.2023AJ....166...95Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/183 : UBVRI Photometric Standards (Landolt 1992)II/337 : VISTA Variables in the Via Lactea Survey DR1 (Saito+, 2012)I/337 : Gaia DR1 (Gaia Collaboration, 2016)II/376 : VISTA Variable in the Via Lactea Survey (VVV) DR4.2 (Minniti+, 2023)VII/195 : Globular Clusters in the Milky Way (Harris, 1996)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/505/139 : Abund of red giants in 17 globular clusters (Carretta+, 2009)J/A+A/505/117 : Abund of red giants in 15 globular clusters (Carretta+, 2009)J/MNRAS/413/1275 : VrI light curves of NGC6981 variables (Bramich+, 2011)J/other/RMxAA/50.307 : RR Lyr light curves in NGC 3201 (Arellano Ferro+, 2014)J/ApJ/801/69 : Fe EWs 21 giant star members of NGC3201 (Mucciarelli+, 2015)J/AcA/66/31 : NGC 3201 variable stars in NGC 3201 (Kaluzny+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/95https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/166/95/table2 (Significance S values for V and I filters for 88 candidate variable stars and their classification based on the criteria from Section 3.2.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/166/95/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/166/95/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/166/95/table2?GETtext/xml+votable180.050000true154.36199583-46.411141670.0055555555555555566/38465https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/166/95?format=asciiOpticalInfrareddefaultJ/AJ/166/95/table1Time series for V and I filters of each starSeq[1/88] Sequential star identifiermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilt[VI] Filtermeta.id;instr.filtercharHJD[2456371/2456375] Heliocentric Julian Date of Observationdtime.epochdoubleindexedmag[10.7/82] Standard magnitude in Filtmagphot.mag;em.optdoublee_mag[0.005/0.02] Uncertainty in magmagstat.error;phot.magfloatsigma[0.0002/0.009] Internal errors associated with the DanDIA reduction programmagstat.errordoubleJ/AJ/166/95/table2Significance S values for V and I filters for 88 candidate variable stars and their classification based on the criteria from Section 3.2.Seq[1/88] Sequential star identifiermeta.idintprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[10] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[46] Degree of Declination (J2000)pos.eq.dec;meta.mainSV[-13/16.6] Significance values for V filterstat.fit.goodnessfloatSI[-20/21] Significance values for I filterstat.fit.goodnessfloatGaia? Gaia DR3 identifiermeta.id;meta.mainnullableClassClassificationsrc.classcharLCInteractive Plotmeta.ref.urlcharJ/AJ/166/95/table3Final parameters for all stars classified as variable from the significance testSeq[1/88] Sequential star identifiermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVmag[13.2/16] Mean V-band magnitude from light curvesmagphot.mag;em.opt.VdoubleImag[11.8/15.4] Mean I-band magnitude from light curvesmagphot.mag;em.opt.IdoublePerV[0.14/0.59] V-band period, daysdtime.perioddoublee_PerV[0.00/0.006] Uncertainty in PerVdstat.errordoubleAVmag[0.00/0.8] Amplitude in V bandmagsrc.var.amplitudedoublee_AVmag[0.00/0.03] Uncertainty in AVmagmagstat.error;phot.magdoublePerI[0.14/0.6] I-band period, daysdtime.perioddoublee_PerI[0.0007/0.008] Uncertainty in PerIdstat.errordoubleAImag[0.006/0.5] Amplitude in I bandmagsrc.var.amplitudedoublee_AImag[0.0006/0.02] Uncertainty in AImagmagstat.error;phot.magdoubleTypeGiant Typesrc.classcharJ/AJ/166/95/table4Final parameters for all stars classified as possible variable and dubious from the significance testSeq[2/86] Sequential star identifiermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVmag[12.5/15.9] Mean Vband magnitude from light curvesmagphot.mag;em.opt.VdoubleImag[11/14.7] Mean I-band magnitude from light curvesmagphot.mag;em.opt.IdoublePerV[0.14/0.75] V-band period, daysdtime.perioddoublee_PerV[0.0002/0.02] Uncertainty in PerVdstat.errordoubleAVmag[0.004/0.03] Amplitude in V bandmagsrc.var.amplitudedoublee_AVmag[0.0006/0.002] Uncertainty in AVmagmagstat.error;phot.magdoublePerI[0.11/0.74] I-band period, daysdtime.perioddoublee_PerI[0.0003/0.02] Uncertainty in PerIdstat.errordoubleAImag[0.003/0.02] Amplitude in I bandmagsrc.var.amplitudedoublee_AImag[0.0005/0.002] Uncertainty in AImagmagstat.error;phot.magdoubleTypeGiant Typesrc.classchar