J/AJ/161/120ivo://CDS.VizieR/J/AJ/161/120doi:10.26093/cds/vizier.51610120CDSMartinez-Vazquez C.E.Salinas R.Vivas A.K.2023-10-02T08:23:16Z2021-05-10T06:50:14ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsinfrared-photometryvisible-astronomyphotometryDelta Scuti ({delta}Sct) stars have been extensively studied in our Galaxy but far less in extragalactic systems. Here we study the population of {delta}Sct variables in NGC419, an intermediate-age globular cluster of the Small Magellanic Cloud (SMC), using g, r, and i Gemini-S/Gemini Multi-Object Spectrograph (GMOS) time-series observations. Our goal is to study the role of such variables in the cluster extended main-sequence turnoff (MSTO). We report the discovery of 54 {delta}Sct stars and three eclipsing binaries in the NGC419 field. We find only a handful of the {delta}Sct stars at the MSTO of NGC419, while the majority are fainter, indicating that the cluster is younger (<~1.2Gyr) than previously thought. Considering their radial distribution, we identify only six {delta}Sct stars as probable members of NGC419, while the 48 remaining are likely {delta}Sct stars of the SMC field. Cluster {delta}Sct stars appear close to the red edge of the MSTO, supporting the idea that the extended MSTO has its origin in an age spread. The 48 field {delta}Sct stars represent the largest detection of {delta}Sct stars made in the SMC. The period distribution of these newly detected {delta}Sct stars (0.04day<~P<~0.15day) is similar to that detected in other systems. The amplitude distribution (0.05mag<~{Delta}r<~0.60mag) is likely biased because of the lack of low-amplitude stars. We finally use the {delta}Sct stars to calculate distances using different period-luminosity relations. The average distance moduli obtained are 18.76{+/-}0.14mag for NGC419 and 18.86{+/-}0.11mag for the SMC field, which agree with previous measurements.2021AJ....161..120Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/122/131 : Delta Scuti rotational velocities and Teff (Solano+ 1997)J/AJ/115/193 : RR Lyrae V light curves (Layden, 1998)J/A+AS/144/469 : Delta Scuti stars (Rodriguez+, 2000)J/AJ/132/1630 : CaII spectro. in Magellanic Cloud clusters (Grocholski+, 2006)J/AJ/131/895 : Stars in the Carina dwarf spheroidal galaxy (Koch+, 2006)J/MNRAS/389/678 : Catalogue of extended objects Magellanic Clouds (Bica+, 2008)J/AJ/136/1039 : CaII index of SMC red giant branch stars (Carrera+, 2008)J/AJ/135/836 : Calcium triplet index in LMC stars (Carrera+, 2008)J/AJ/136/1703 : Ridgelines of six intermediate-age SMC clusters (Glatt+, 2008)J/ApJ/685/947 : SX Phe stars in Fornax. II. (Poretti+, 2008)J/AJ/140/328 : LMC High-amplitude delta Scuti stars (Garg+, 2010)J/AcA/60/1 : VI light curves of LMC delta Scuti stars (Poleski+, 2010)J/MNRAS/419/342 : SX Phe stars in globular clusters (Cohen+, 2012)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/AJ/145/160 : Variables LMC globular clusters. III. Reticulum (Kuehn+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/AJ/146/141 : BV photometry of dwarf Cepheids in Carina (Vivas+, 2013)J/ApJ/780/59 : Araucaria project: eclipsing binaries in SMC (Graczyk+, 2014)J/ApJ/814/71 : Carina project IX: UBVI data Carina variables (Coppola+, 2015)J/AcA/65/233 : OGLE Magellanic Clouds anomalous Cepheids (Soszynski+, 2015)J/AcA/65/297 : OGLE4 LMC and SMC Cepheids (Soszynski+, 2015)J/MNRAS/462/4349 : Variable stars in Sculptor dSph (Martinez-Vazquez+, 2016)J/AcA/66/421 : Eclipsing binaries in the Magellanic System (Pawlak+, 2016)J/AcA/66/131 : VI light curves of SMC and LMC RR Lyrae (Soszynski+, 2016)J/MNRAS/473/3131 : VMC survey. XXVI. SMC RR Lyrae stars (Muraveva+, 2018)J/AJ/155/183 : Properties of variables in the NGC 1846 field (Salinas+, 2018)J/AJ/157/35 : Population pulsating variable stars in Sextans (Vivas+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/120https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/161/120/table3 (Position and mean pulsation properties of the variables stars detected and discovered in NGC419)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/161/120/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/161/120/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/161/120/table3?GETtext/xml+votable180.050000true16.92741694-72.8475250.0055555555555555566/33304https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/161/120?format=asciiOpticalInfrareddefaultJ/AJ/161/120/table3Position and mean pulsation properties of the variables stars detected and discovered in NGC419recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNobsNumber of observations (table4)meta.numberintnullableRAJ2000[16.92/17.23] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-72.93/-72.83] Declination (J2000)degpos.eq.dec;meta.mainrmag[16.07/22.37] Weighted intensity-average r band magnitude (1)magphot.mag;em.opt.Rfloatgmag[16.39/22.63] Weighted intensity-average g band magnitude (1)magphot.mag;em.opt.Vfloatimag[16.07/22.43] Weighted intensity-average i band magnitude (1)magphot.mag;em.opt.IfloatRoMS[1.6/84.6] The robust median statistic valuestat.value;stat.medianfloatJ[2.2/122.1] Welch-Stetson variability indexsrc.var.indexfloatPer[0.03/251] Perioddtime.perioddoublerint[18.8/22.5]? Intensity-averaged r band magnitude (3)magphot.mag;em.opt.RfloatnullableDelr[0.05/0.76]? r band amplitudemagsrc.var.amplitudefloatnullablegint[18.65/22.7]? Intensity-averaged g band magnitude (3)magphot.mag;em.opt.VfloatnullableDelg[0.01/1.45]? g band amplitudemagsrc.var.amplitudefloatnullableiint[19.06/22.52]? Intensity-averaged i band magnitude (3)magphot.mag;em.opt.IfloatnullableDeli[0/0.8]? i band amplitudemagsrc.var.amplitudefloatnullableIDVariable identifiermeta.id;meta.maincharprimaryf_ID[*] Flag means A{delta} Scuti star within 2r_h_ of NGC 419 (6 occurrences)meta.codecharTypeVariable type (2)src.classcharu_Per[:] Uncertainty flag on Periodmeta.code.errorcharu_rint[:] Uncertainty flag on rintmeta.code.errorcharl_DelrLimit flag on Delrmeta.code.errorcharu_Delr[:] Uncertainty flag on Delrmeta.code.errorcharu_gint[:] Uncertainty flag on gintmeta.code.errorcharu_Delg[:] Uncertainty flag on Delgmeta.code.errorcharu_Deli[:] Uncertainty flag on Delimeta.code.errorcharOGLEPrevious name; OGLE identifiermeta.id.crosscharLCInteractive Plotmeta.ref.urlcharu_iint[:] Uncertainty flag on iintmeta.code.errorcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/161/120/table4Photometry of the variable stars in NGC 419MJDg[58010/58024]? Modified Julian Date of g band observation at mid-exposuredtime.epochdoublenullablegmag[16.33/23.14]? Apparent g band magnitudemagphot.mag;em.opt.Vfloatnullablee_gmag[0.001/0.2]? Uncertainty in gmagmagstat.error;phot.magfloatnullableMJDi[58010/58024]? Modified Julian Date of i band observation at mid-exposuredtime.epochdoublenullableimag[15.91/23.19]? Apparent i band magnitudemagphot.mag;em.opt.Ifloatnullablee_imag[0/0.26]? Uncertainty in imagmagstat.error;phot.magfloatnullableIDVariable identifiermeta.id;meta.mainchare_rmag[0.001/0.6] Uncertainty in rmagmagstat.error;phot.magfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDr[58010/58024] Modified Julian Date of r band observation at mid-exposuredtime.epochdoublermag[16.03/22.97] Apparent r band magnitudemagphot.mag;em.opt.Rfloat