J/AJ/165/28ivo://CDS.VizieR/J/AJ/165/28doi:10.26093/cds/vizier.51650028CDSAdair S.Lee C.-H.2023-10-02T10:33:11Z2023-06-07T06:40:11ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomyphotometryIn this paper we analyze Sloan g,r,i archival imaging data of M33 taken by Hartman et al. using MegaCam at the Canada-France-Hawaii Telescope. To determine the distance to the M33 galaxy, we performed several analytical steps to identify its Cepheid population. We used the Lomb-Scargle algorithm to find periodicity and visually identified 1989 periodic variable stars. Since Cepheids occupy a specific region of the color-magnitude diagram, to differentiate Cepheids from other variables we used the expected position of the Cepheid instability strip to down-select Cepheids in M33 from other variables. This led to our sample of 1622 variables, the largest Cepheid sample known in M33 to date. We further classified these Cepheids into different subclasses, and used the fundamental mode Cepheids to estimate distance moduli for M33 in different filters: {mu}=25.044{+/-}0.083mag in the g filter, {mu}=24.886{+/-}0.074mag in the r filter, and {mu}=24.785{+/-}0.068mag for the i filter. These results are in agreement with previous results.2023AJ....165...28Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/28CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/121/870 : BVI photometry of Variables in M33 (Macri+, 2001)J/ApJ/614/167 : Planetary nebulae in M33 (Ciardullo+, 2004)J/ApJ/652/313 : BV phot. of a detached eclipsing binary in M33 (Bonanos+, 2006)J/MNRAS/371/1405 : Variables in M33 (Hartman+, 2006)J/A+A/476/73 : Calibration Cepheid Period/Luminosity relation (Fouque+, 2007)J/ApJ/715/277 : Insights into the Cepheid distance scale (Bono+, 2010)J/A+A/509/A70 : Study of an eclipsing binary in M31 (Vilardell+, 2010)J/ApJ/724/799 : RR Lyrae variables in M33. II. (Yang+, 2010)J/ApJS/193/26 : The M33 synoptic stellar survey. I. (Pellerin+, 2011)J/AJ/145/106 : M31 Cepheid disk sample of 1st year of PS1 (Kodric+, 2013)J/AJ/153/170 : M33 Synoptic Stellar Survey. II. Mira variables (Yuan+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/28https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/28http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/28https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/28https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/28http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/28GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/28/table2 (Parameters of the Cepheids identified by this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/28/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/28/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/28/table2?GETtext/xml+votable180.050000true23.79037531.089333060.0055555555555555566/2154-2155 2240-2241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/28?format=asciiOpticalInfrareddefaultJ/AJ/165/28/table2Parameters of the Cepheids identified by this workgmag[19/23.6] Mean apparent g-band magnitudemagphot.mag;em.opt.Vfloatrmag[18.5/23.1] Mean apparent r-band magnitudemagphot.mag;em.opt.Rfloatimag[18.2/22.9] Mean apparent i-band magnitudemagphot.mag;em.opt.IfloatA[0.004/1.23] Amplitude ratio from r-bandmagphot.mag;arith.ratiodoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[20018/350116] Identifiermeta.id;meta.mainintRAJ2000[23/24] Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000[30/32] Declination in decimal degrees (J2000)degpos.eq.dec;meta.maing-Per[1.19/103] Period from g-band photometrydtime.perioddoubler-Per[1.18/104] Period from r-band photometrydtime.perioddoublei-Per[1.18/103] Period from i-band photometrydtime.perioddoubleWmag[17.2/22.5] Wesenheit magnitude from r and i-bandsmagphot.mag;em.optfloatTypeType classification (1)src.classchar