J/AJ/121/2032ivo://CDS.VizieR/J/AJ/121/2032doi:10.26093/cds/vizier.51212032CDSMochejska B.J.Kaluzny J.Stanek K.Z.Sasselov D.D.Szentgyorgyi A.H.2023-04-06T16:50:41Z2006-12-17T09:18:56ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomybroad-band-photometryDIRECT is a project to directly obtain the distances to two Local Group galaxies, M31 and M33, which occupy a crucial position near the bottom of the cosmological distance ladder. As the first step of the DIRECT project, we have searched for detached eclipsing binaries (DEBs) and new Cepheids in the M31 and M33 galaxies with 1 m class telescopes. In this paper, we present a catalog of variable stars discovered in the data from the follow-up observations of the DEB system D33J013346.2+304439.9 in field M33A (RA=23.55{deg}, DE=30.72{deg}; J2000.0), collected with the Kitt Peak National Observatory's 2.1 m telescope. In our search covering an area of 108arcmin^2^, we have found 434 variable stars: 63 eclipsing binaries, 305 Cepheids, and 66 other periodic, possible long-period, or nonperiodic variables. Of these variables, 280 are newly discovered, mainly short-period and/or faint Cepheids. Their light curves were extracted using the ISIS image subtraction package. For 85% of the variables, we present light curves in standard V and B magnitudes, with the remaining 15% expressed in units of differential flux. We have discovered a population of first-overtone Cepheid candidates, and for eight of them we present strong arguments in favor of this interpretation. We also report on the detection of a nonlinearity in the KPNO T2KA and T1KA cameras.2001AJ....121.2032Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/121/2032CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/121/861 : BVI photometry of central part of M33 (Macri+, 2001)J/AJ/121/870 : BVI photometry of Variables in M33 (Macri+, 2001)http://cfa-www.harvard.edu/~kstanek/DIRECT : DIRECT homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/121/2032https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/121/2032http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/121/2032https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/121/2032https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/121/2032http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/121/2032GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/121/2032/table2 (DIRECT eclipsing binaries in M33A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/2032/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/2032/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/2032/table2?GETtext/xml+votable180.050000true23.55416730.6691110.005555555555555556Cone search capability for table J/AJ/121/2032/table3 (DIRECT flux eclipsing binaries in M33A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/2032/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/2032/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/2032/table3?GETtext/xml+votable180.050000true23.49416730.8102780.005555555555555556Cone search capability for table J/AJ/121/2032/table5 (DIRECT Cepheids in M33A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/2032/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/2032/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/2032/table5?GETtext/xml+votable180.050000true23.5087530.7594440.005555555555555556Cone search capability for table J/AJ/121/2032/table6 (DIRECT flux cepheids in M33A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/2032/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/2032/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/2032/table6?GETtext/xml+votable180.050000true23.42291730.6971390.005555555555555556Cone search capability for table J/AJ/121/2032/table8 (DIRECT other periodic variables in M33A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/2032/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/2032/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/2032/table8?GETtext/xml+votable180.050000true23.52958330.6571110.005555555555555556Cone search capability for table J/AJ/121/2032/table10 (DIRECT miscellaneous variables in M33A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/2032/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/2032/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/2032/table10?GETtext/xml+votable180.050000true23.41541730.7615560.0055555555555555566/2155https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/121/2032?format=asciiOpticaldefaultJ/AJ/121/2032/table2DIRECT eclipsing binaries in M33ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD33Binary name, JHHMMSS.s+DDMMSS.s (G1)meta.id;meta.maincharprimaryPerPeriod of the systemdtime.periodfloatVmag? Maximum V band magnitude outside of eclipsemagphot.mag;em.opt.VfloatnullableBmag? Maximum B band magnitude outside of eclipsemagphot.mag;em.opt.BfloatnullableR1Estimated primary component radius in units of the orbital separationphys.size.radius;arith.ratiofloatR2Estimated secondary component radius in units of the orbital separationphys.size.radius;arith.ratiofloatIncEstimated inclination angle of the orbitdegsrc.orbital.inclinationfloatEccenEstimated eccentricity of the orbitsrc.orbital.eccentricityfloatCom? Comments (G2)meta.noteintnullableLCurvedraw the light curvemeta.ref.urlchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/AJ/121/2032/table3DIRECT flux eclipsing binaries in M33APerPerioddtime.periodfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD33Name, JHHMMSS.s+DDMMSS.s (G1)meta.id;meta.maincharprimaryCom? Comment (G2)meta.noteintnullableLCurvedraw the light curvemeta.ref.urlchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/AJ/121/2032/lcLight curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD33Object name, JHHMMSS.s+DDMMSS.s (G1)meta.id;meta.maincharFilterFilter passband (1)instr.bandpasscharHJDJulian date of observationdtime.epochdoubleDataObserved magnitude or differential fluxmagphot.magdoublee_DataUncertainty in Datamagstat.errorfloatJ/AJ/121/2032/table5DIRECT Cepheids in M33ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD33Cepheid or object name, JHHMMSS.s+DDMMSS.s (G1)meta.id;meta.maincharprimaryPerPeriod of the systemdtime.periodfloatVmag? Flux-weighted average V band magnitudemagphot.mag;em.opt.VfloatnullableBmag? Flux-weighted average B band magnitudemagphot.mag;em.opt.BfloatnullableVamp? The V band amplitudemagsrc.var.amplitudefloatnullableBamp? The B band amplitudemagsrc.var.amplitudefloatnullableComComments (G2)meta.notecharLCurvedraw the light curvemeta.ref.urlchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/AJ/121/2032/table6DIRECT flux cepheids in M33ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD33Name, JHHMMSS.s+DDMMSS.s (G1)meta.id;meta.maincharprimaryPerPerioddtime.periodfloatCom? Comment (G2)meta.noteintnullableLCurvedraw the light curvemeta.ref.urlchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/AJ/121/2032/table8DIRECT other periodic variables in M33ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD33Variable name, JHHMMSS.s+DDMMSS.s (G1)meta.id;meta.maincharprimaryPerPerioddtime.periodfloatVmag? Maximum V magnitudemagphot.mag;em.opt.VfloatnullableBmag? Maximum B magnitudemagphot.mag;em.opt.Bfloatnullable<Vmag>? Flux-weighted average magnitudesmagphot.mag;em.opt.Vfloatnullable<Bmag>? Flux-weighted average magnitudesmagphot.mag;em.opt.BfloatnullableComComments (EB = Eclipsing binary)meta.notecharLCurvedraw the light curvemeta.ref.urlchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/AJ/121/2032/table10DIRECT miscellaneous variables in M33ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD33Cepheid or object name, JHHMMSS.s+DDMMSS.s (G1)meta.id;meta.maincharprimaryVmag? The average V band magnitudemagphot.mag;em.opt.VfloatnullableBmag? The average B band magnitudemagphot.mag;em.opt.BfloatnullableVamp? The V band amplitudemagsrc.var.amplitudefloatnullableBamp? The B band amplitudemagsrc.var.amplitudefloatnullableCom? Comment (G2)meta.noteintnullableLCurvedraw the light curvemeta.ref.urlchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main