J/ApJ/699/1742ivo://CDS.VizieR/J/ApJ/699/1742doi:10.26093/cds/vizier.16991742CDSBernard E.J.Monelli M.Gallart C.Drozdovsky I.Stetson P.B.,Aparicio A.Cassisi S.Mayer L.Cole A.A.Hidalgo S.L.Skillman E.D.,Tolstoy E.2017-06-26T11:49:22Z2011-08-10T12:19:41ZCDS support team

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

cds-question@unistra.frgalaxieshst-photometryvariable-starsWe present the first study of the variable star populations in the isolated dwarf spheroidal galaxies (dSphs) Cetus and Tucana. Based on Hubble Space Telescope images obtained with the Advanced Camera for Surveys in the F475W and F814W bands, we identified 180 and 371 variables in Cetus and Tucana, respectively. The vast majority are RR Lyrae stars. In Cetus, we also found three anomalous Cepheids (ACs), four candidate binaries and one candidate long-period variable (LPV), while six ACs and seven LPV candidates were found in Tucana. Of the RR Lyrae stars, 147 were identified as fundamental mode (RRab) and only eight as first-overtone mode (RRc) in Cetus, with mean periods of 0.614 and 0.363 day, respectively. In Tucana, we found 216 RRab and 82 RRc giving mean periods of 0.604 and 0.353 day. These values place both galaxies in the so-called Oosterhoff Gap, as is generally the case for dSph. We found numerous RR Lyrae variables pulsating in both modes simultaneously (RRd): 17 in Cetus and 60 in Tucana. We provide the photometry and pulsation parameters for all the variables, and compare the latter with values from the literature for well studied dSph of the Local Group and Galactic globular clusters. The parallel WFPC2 fields were also searched for variables, as they lie well within the tidal radius of Cetus, and at its limit in the case of Tucana. No variables were found in the latter, while 15 were discovered in the outer field of Cetus (11 RRab, three RRc, and one RRd), even though the lower signal-to-noise ratio of the observations did not allow us to measure their periods accurately. We provide their coordinates and approximate properties for completeness.2009ApJ...699.1742Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/699/1742CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/AJ/133/715 : Dwarf galaxies of the Local Group (Whiting+, 2007)J/AJ/120/1801 : C stars in Pegasus, DDO 210 and Tucana (Battinelli+, 2000)J/A+A/310/715 : Tucana dwarf galaxy VI photometry (Castellani+, 1996)J/A+A/315/40 : Photometry of the Tuc dwarf galaxy (Saviane, 1996)http://www.iac.es/proyecto/LCID/ : Local Cosmology from Isolated Dwarfshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/699/1742https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/699/1742http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/699/1742https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/699/1742https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/699/1742http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/699/1742GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/699/1742/table7 (Pulsation properties of variable stars in Cetus - ACS field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/699/1742/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/699/1742/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/699/1742/table7?GETtext/xml+votable180.050000true6.511375-11.06127780.005555555555555556Cone search capability for table J/ApJ/699/1742/table9 (Pulsation properties of variable stars in Cetus - WFPC2 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/699/1742/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/699/1742/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/699/1742/table9?GETtext/xml+votable180.050000true6.4515-11.02655560.005555555555555556Cone search capability for table J/ApJ/699/1742/table8 (Pulsation properties of variable stars in Tucana)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/699/1742/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/699/1742/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/699/1742/table8?GETtext/xml+votable180.050000true340.3785-64.41327780.0055555555555555566/17229 454231.9821045660507152e-19 4.9761815603361e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/699/1742?format=asciiOpticaldefaultJ/ApJ/699/1742/table7Pulsation properties of variable stars in Cetus - ACS fieldLCLight curves of starmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification (in Simbad: <[BMG2009] Cetus ACS VNNN> for table 7 or <[BMG2009] Tucana VNNN> for table 8 )meta.id;meta.mainintprimaryTypeVariable classification (G2)src.classcharu_Per[u] Indicates an uncertainty in period, magnitudes, or amplitudesmeta.code.errorcharPer? Perioddtime.periodfloatnullableF475WIntensity-averaged HST/ACS F475W magnitudemagphot.mag;em.opt.BfloatA475? The F475W amplitudemagsrc.var.amplitudefloatnullableF814WIntensity-averaged HST/ACS F814W magnitudemagphot.mag;em.opt.IfloatA814? The F814W amplitudemagsrc.var.amplitudefloatnullableF475-814Intensity-averaged F475W-F814W color indexmagphot.color;em.opt;em.optfloatBmagIntensity-averaged Johnson B magnitudemagphot.mag;em.opt.BfloatBamp? The B amplitudemagsrc.var.amplitude;em.opt.BfloatnullableVmagIntensity-averaged Johnson V magnitudemagphot.mag;em.opt.VfloatVamp? The V amplitudemagsrc.var.amplitude;em.opt.VfloatnullableImagIntensity-averaged Johnson I magnitudemagphot.mag;em.opt.IfloatIamp? The I amplitudemagsrc.var.amplitude;em.opt.IfloatnullableSimbadSimbad column added by the CDScharRAJ2000Hour of right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)phot.color;em.opt;em.optJ/ApJ/699/1742/tucanaHST and BVI photometry of the variable stars in TucanarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification (in Simbad: <[BMG2009] Cetus ACS VNNN> for table 3 or <[BMG2009] Tucana VNNN> for table 4)meta.id;meta.mainintHJD(475)Truncated Heliocentric Julian Date for F475W (G1)dtime.epochdoubleF475W? HST/ACS F475W magnitudemagphot.mag;em.opt.Bfloatnullablee_F475W? Error in F475Wmagstat.errorfloatnullableHJD(814)Truncated Heliocentric Julian Date for F814W (G1)dtime.epochdoubleF814W? The HST/ACS F814W magnitudemagphot.mag;em.opt.Ifloatnullablee_F814W? Error in F814Wmagstat.errorfloatnullableHJD(B)Truncated Heliocentric Julian Date for B (G1)dtime.epochdoubleBmag? The Johnson B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableHJD(V)Truncated Heliocentric Julian Date for V (G1)dtime.epochdoubleVmag? The Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? Error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableHJD(I)Truncated Heliocentric Julian Date for I (G1)dtime.epochdoubleImag? The Johnson I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Error in Imagmagstat.error;phot.mag;em.opt.IfloatnullableJ/ApJ/699/1742/table9Pulsation properties of variable stars in Cetus - WFPC2 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification (in Simbad: <[BMG2009] Cetus WFPC2 VNNN>)meta.id;meta.mainintTypeVariable classification (G2)src.classcharu_Per[u] Indicates an uncertainty in period, magnitudes, or amplitudesmeta.code.errorcharPerPerioddtime.periodfloatF450WIntensity-averaged F450W magnitudemagphot.mag;em.opt.BfloatF814WIntensity-averaged F814W magnitudemagphot.mag;em.opt.IfloatF450-814Intensity-averaged F450W-F814W color indexmagphot.color;em.opt;em.optfloatA450The F450W amplitudemagsrc.var.amplitudefloatA814The F814W amplitudemagsrc.var.amplitudefloatSimbadSimbad column added by the CDScharRAJ2000Hour of right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)phot.color;em.opt;em.optJ/ApJ/699/1742/table8Pulsation properties of variable stars in TucanarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification (in Simbad: <[BMG2009] Cetus ACS VNNN> for table 7 or <[BMG2009] Tucana VNNN> for table 8 )meta.id;meta.mainintprimaryTypeVariable classification (G2)src.classcharLCLight curves of starmeta.ref.urlcharu_Per[u] Indicates an uncertainty in period, magnitudes, or amplitudesmeta.code.errorcharPer? Perioddtime.periodfloatnullableF475WIntensity-averaged HST/ACS F475W magnitudemagphot.mag;em.opt.BfloatA475? The F475W amplitudemagsrc.var.amplitudefloatnullableF814WIntensity-averaged HST/ACS F814W magnitudemagphot.mag;em.opt.IfloatA814? The F814W amplitudemagsrc.var.amplitudefloatnullableF475-814Intensity-averaged F475W-F814W color indexmagphot.color;em.opt;em.optfloatBmagIntensity-averaged Johnson B magnitudemagphot.mag;em.opt.BfloatBamp? The B amplitudemagsrc.var.amplitude;em.opt.BfloatnullableVmagIntensity-averaged Johnson V magnitudemagphot.mag;em.opt.VfloatVamp? The V amplitudemagsrc.var.amplitude;em.opt.VfloatnullableImagIntensity-averaged Johnson I magnitudemagphot.mag;em.opt.IfloatIamp? The I amplitudemagsrc.var.amplitude;em.opt.IfloatnullableSimbadSimbad column added by the CDScharRAJ2000Hour of right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)phot.color;em.opt;em.optJ/ApJ/699/1742/cetusHST and BVI photometry of the variable stars in Cetuse_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.BfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification (in Simbad: <[BMG2009] Cetus ACS VNNN> for table 3 or <[BMG2009] Tucana VNNN> for table 4)meta.id;meta.mainintHJD(475)Truncated Heliocentric Julian Date for F475W (G1)dtime.epochdoubleF475W? HST/ACS F475W magnitudemagphot.mag;em.opt.Bfloatnullablee_F475W? Error in F475Wmagstat.errorfloatnullableHJD(814)Truncated Heliocentric Julian Date for F814W (G1)dtime.epochdoubleF814W? The HST/ACS F814W magnitudemagphot.mag;em.opt.Ifloatnullablee_F814W? Error in F814Wmagstat.errorfloatnullableHJD(B)Truncated Heliocentric Julian Date for B (G1)dtime.epochdoubleBmag? The Johnson B magnitudemagphot.mag;em.opt.BfloatnullableHJD(V)Truncated Heliocentric Julian Date for V (G1)dtime.epochdoubleVmag? The Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? Error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableHJD(I)Truncated Heliocentric Julian Date for I (G1)dtime.epochdoubleImag? The Johnson I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Error in Imagmagstat.error;phot.mag;em.opt.Ifloatnullable