J/MNRAS/480/669ivo://CDS.VizieR/J/MNRAS/480/669doi:10.26093/cds/vizier.74800669CDSPrudil Z.Grebel E.K.Dekany I.Smolec R.2024-08-18T20:21:37Z2020-03-09T07:34:06ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsvariable-starsphotometryWe present a study of a recently discovered stellar overdensity near the northern edge of the Small Magellanic Cloud (SMCNOD). We exploited variable stars from the fourth release of the Optical Gravitational Lensing Experiment. We used mainly pulsating variable stars and investigated their potential association with the SMCNOD using their spatial distribution and distances. We found four rather spatially concentrated anomalous Cepheids and eight evenly dispersed RR Lyrae stars to be most likely members of this overdensity. The anomalous Cepheids inside the SMCNOD trace possible intermediate-age population with ages ranging between 2 and 4.5Gyr. The age distribution of anomalous Cepheids seems to be in a good agreement with the age distribution of anomalous Cepheids in the SMC. Using empirical relations for RR Lyrae stars, we determined the median metallicity for a possible old population in the SMCNOD to be [Fe/H]_SMCNOD_=-1.71+/-0.21dex, which is in agreement with median metallicity of the old SMC population. The density profile for anomalous Cepheids shows a small anomaly at the position of the SMCNOD, on the other hand, RR Lyrae variables show no such deviation. The probability of finding the observed number of variable stars at the location of the SMCNOD by chance is very low for anomalous Cepheids (0.7 per cent) but high for RR Lyrae stars (13.0 per cent). Based on its variable stars content, we thus confirm the presence of a modest overdensity in intermediate-age stars in the SMCNOD and conclude that it probably has its origin in the SMC rather than to be the remnant of an accreted dwarf galaxy.2018MNRAS.480..669Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/480/669CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/65/233 : OGLE Magellanic Clouds anomalous Cepheids (Soszynski+, 2015)J/AcA/65/297 : OGLE4 LMC and SMC Cepheids (Soszynski+, 2015)J/AcA/66/131 : VI light curves of SMC and LMC RR Lyrae (Soszynski+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/480/669https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/480/669http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/480/669https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/480/669https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/480/669http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/480/669GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/480/669/acsmcnod (Anomalous Cepheids in SMCNOD (table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/669/acsmcnod?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/669/acsmcnod?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/669/acsmcnod?GETtext/xml+votable180.050000true349.23904-75.50250.005555555555555556Cone search capability for table J/MNRAS/480/669/rrsmcnod (RR Lyraes in SMCNOD (table 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/669/rrsmcnod?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/669/rrsmcnod?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/669/rrsmcnod?GETtext/xml+votable180.050000true4.97796-74.701170.0055555555555555563/520 4/2059 2088 5/8227-8228 8230 8233-8235 8250 8336-8338 8356-8357 8359 8361 11329 11332-11333 11344 11348 6/32830 32916 32918-32919 32924 32926-32927 32929-32931 32962 32968 32971 32993-32996 32998 33004 33006-33007 33016 33018 33023 33194 33356 33358-33359 33362-33363 33366 33368-33369 33371-33372 33375-33376 33378-33382 33384-33385 33387-33388 33390 33400 33432-33433 33435 33440-33441 33443 33448-33450 33453-33454 33456 33458 33460 33462-33466 33473 33475 33478 33480-33481 33483 34816 34818 34820-34822 34824-34826 45137-45139 45141-45144 45148-45149 45313-45314 45321 45336-45337 45341 45380-45382 45384-45385 45389 45396-45398 45400 45405 46080-46082 46084-46085 46088-46089https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/480/669?format=asciidefaultJ/MNRAS/480/669/acsmcnodAnomalous Cepheids in SMCNOD (table 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/119] OGLE identifier, OGLE SMC-ACEP-NNNmeta.id;meta.mainintmode[F 1O] Pulsation mode, F (fundamental) 1O (first overtone)meta.code;src.varcharRAJ2000[] Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maindDistancekpcpos.distancefloate_dUncertainty on distancekpcstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/480/669/rrsmcnodRR Lyraes in SMCNOD (table 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/6567] OGLE identifier, OGLE SMC-RRLYR-NNNN in Simbadmeta.id;meta.mainintRAJ2000[] Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maindDistancekpcpos.distancefloate_dUncertainty on distancekpcstat.errorfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]Uncertainty on metallicitystat.error;phys.abund.FefloatSimbadSimbad column added by the CDSmeta.ref.urlchar