J/ApJ/712/1259ivo://CDS.VizieR/J/ApJ/712/1259doi:10.26093/cds/vizier.17121259CDSBernard E.J.Monelli M.Gallart C.Aparicio A.Cassisi S.,Drozdovsky I.Hidalgo S.L.Skillman E.D.Stetson P.B.2017-11-06T12:24:12Z2012-05-14T12:52:01ZCDS support team

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

cds-question@unistra.frhst-photometryvariable-starseclipsing-binary-starsgalaxiesWe present the results of a new search for variable stars in the Local Group (LG) isolated dwarf galaxy IC 1613, based on 24 orbits of F475W and F814W photometry from the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope. We detected 259 candidate variables in this field, of which only 13 (all of them bright Cepheids) were previously known. Out of the confirmed variables, we found 90 RR Lyrae stars, 49 classical Cepheids (including 36 new discoveries), and 38 eclipsing binary stars for which we could determine a period. The RR Lyrae include 61 fundamental (RRab) and 24 first-overtone (FO, RRc) pulsators, and five pulsating in both modes simultaneously (RRd). As for the majority of LG dwarfs, the mean periods of the RRab and RRc (0.611 and 0.334 days, respectively) as well as the fraction of overtone pulsators (f_c_=0.28) place this galaxy in the intermediate regime between the Oosterhoff types. From their position on the period-luminosity diagram and light-curve morphology, we can unambiguously classify 25 and 14 Cepheids as fundamental and FO mode pulsators, respectively. Another two are clearly second-overtone Cepheids, the first ones to be discovered beyond the Magellanic Clouds. Among the remaining candidate variables, five were classified as {delta}-Scuti and five as long-period variables. Most of the others are located on the main sequence, the majority of them likely eclipsing binary systems, although some present variations similar to pulsating stars.2010ApJ...712.1259Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/712/1259CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)B/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJ/699/1742 : LCID project. I. Cetus and Tucana variables (Bernard+, 2009)J/A+A/445/901 : BV(RI)c bands of Cepheids in IC 1613 (Antonello+, 2006)J/AcA/51/221 : OGLE-II. Cepheids in IC 1613 (Udalski+, 2001)J/A+A/367/759 : Variable stars in IC 1613 (Mantegazza+, 2001)J/A+A/363/29 : Variable stars in IC 1613 (Antonello+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/712/1259https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/712/1259http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/712/1259https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/712/1259https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/712/1259http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/712/1259GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/712/1259/table4 (Pulsation properties of variable stars in IC1613: ACS field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/712/1259/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/712/1259/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/712/1259/table4?GETtext/xml+votable180.050000true16.08708332.17688890.005555555555555556Cone search capability for table J/ApJ/712/1259/table5 (Candidate variable stars in IC1613: ACS field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/712/1259/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/712/1259/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/712/1259/table5?GETtext/xml+votable180.050000true16.08445832.17461110.0055555555555555566/180411.9821045660507152e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/712/1259?format=asciiOpticaldefaultJ/ApJ/712/1259/table4Pulsation properties of variable stars in IC1613: ACS fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BMG2010]Object identification (VNNN)meta.id;meta.maincharTypeVariable classification (1)src.classcharRAJ2000Hour of right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainLCLight curves from HST/ACS photometry F475W, F814Wmeta.ref.urlcharu_Per[u] Indicates an uncertainty in period, magnitudes, or amplitudesmeta.code.errorcharPerPerioddtime.periodfloatlogPLogarithm of the Periodlog(d)time.periodfloatF475WIntensity-averaged HST/ACS F475W magnitudemagphot.mag;em.opt.BfloatF475ampThe F475W amplitudemagsrc.var.amplitude;em.opt.BfloatF814WIntensity-averaged HST/ACS F814W magnitudemagphot.mag;em.opt.IfloatF814ampThe F814W amplitudemagsrc.var.amplitudefloatF475-814Intensity-averaged F475W-F814W color indexmagphot.color;em.opt.B;em.opt.IfloatBmagIntensity-averaged B magnitudemagphot.mag;em.opt.BfloatBampThe B amplitudemagsrc.var.amplitude;em.opt.BfloatVmagIntensity-averaged V magnitudemagphot.mag;em.opt.VfloatVampThe V amplitudemagsrc.var.amplitude;em.opt.VfloatImagIntensity-averaged I magnitudemagphot.mag;em.opt.IfloatIampThe I amplitudemagsrc.var.amplitude;em.opt.IfloatSimbadSimbad column added by the CDSmeta.refcharJ/ApJ/712/1259/table5Candidate variable stars in IC1613: ACS fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BMG2010]Object identification (VCNNN)meta.id;meta.maincharTypeVariable classification (1)src.classcharRAJ2000Hour of right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainm475The HST/ACS F475W magnitudemagphot.mag;em.opt.Bfloatm814The HST/ACS F814W magnitudemagphot.mag;em.opt.IfloatLCLight curves from HST/ACS photometry F475W, F814Wmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refcharJ/ApJ/712/1259/table3Photometry of the variable stars in IC1613: Johnson bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BMG2010]Object identification (VNNN or VCNNN)meta.id;meta.maincharHJD-BHeliocentric Julian Date at mid-exposure for Bdtime.epochdoubleBmag? The Johnson B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableHJD-VHeliocentric Julian Date at mid-exposure for Vdtime.epochdoubleVmag? The Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? Error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableHJD-IHeliocentric Julian Date at mid-exposure for Idtime.epochdoubleImag? The Johnson I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Error in Imagmagstat.error;phot.mag;em.opt.IfloatnullableJ/ApJ/712/1259/table2Photometry of the variable stars in IC1613: HST bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BMG2010]Object identification (VNNN or VCNNN)meta.id;meta.maincharHJD-475Heliocentric Julian Date at mid-exposure for m475dtime.epochdoublem475? The HST/ACS F475W magnitudemagphot.mag;em.opt.Bfloatnullablee_m475? Error in m475magstat.errorfloatnullableHJD-814Heliocentric Julian Date at mid-exposure for m814dtime.epochdoublem814? The HST/ACS F814W magnitudemagphot.mag;em.opt.Ifloatnullablee_m814? Error in m814magstat.errorfloatnullable