J/A+A/402/113ivo://CDS.VizieR/J/A+A/402/113doi:10.26093/cds/vizier.34020113CDSJoshi Y.C.Pandey A.K.Narashimha D.Sagar R.Giraud-Heraud Y.2017-07-12T15:17:47Z2003-05-20T22:32:15ZCDS support team

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

cds-question@unistra.frvariable-starsvisible-astronomykron-cousins-photometryWe present Cousins R and I band photometry of variable stars in a ~13'x13' region in the disk of M31 galaxy, obtained during 141 nights. Of the 26 Cepheid variables present in the region, two are newly discovered, 11 are classified as Cepheids for the first time and 13 are confirmed as Cepheids. The extensive photometry of these Cepheids enabled us to determine precise phase and amplitude of pulsation which ranges from 0.11 to 0.48mag in R band. The period of variability ranges from ~7.5 to 56 days. The period-luminosity diagram is used to derive a distance modulus of 24.49+/-0.11mag for M31 galaxy. We also report variability in 333 other stars, of them, 115 stars appear to be long period variables, 2 suspected eclipsing binaries and remaining 216 are irregular variables.2003A&A...402..113Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/402/113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/126/401 : M 31 Cepheids periods (Magnier+ 1997)J/AJ/115/1894 : M31A eclipsing binaries and Cepheids (Stanek+ 1998)J/AJ/115/1016 : M31B eclipsing binaries and Cepheids (Kaluzny+ 1998)J/AJ/117/2810 : M31C eclipsing binaries and Cepheids (Stanek+ 1999)J/AJ/118/346 : M31D eclipsing binaries and Cepheids (Kaluzny+ 1999)J/AJ/118/2211 : M31F eclipsing binaries and Cepheids (Mochejska+ 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/402/113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/402/113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/402/113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/402/113https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/402/113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/402/113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/402/113/table4 (List of 26 Cepheids observed in our study with their characteristic parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/402/113/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/402/113/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/402/113/table4?GETtext/xml+votable180.050000true10.932141.1970.005555555555555556Cone search capability for table J/A+A/402/113/table5 (The celestial coordinates of 333 variables detected during our observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/402/113/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/402/113/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/402/113/table5?GETtext/xml+votable180.050000true10.726441.15780.0055555555555555566/26232.367228618189496e-19 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/402/113?format=asciiOpticaldefaultJ/A+A/402/113/table2Journal of the RI observations during the period 1998-2002HJDHeliocentric Julian date of observationtime.epochintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observationtime.epochnullableExpRc1? Total exposure time in Rc filtermintime.duration;obs.exposure;em.opt.RintnullableExpRc2? Total exposure time in Rc filtermintime.duration;obs.exposure;em.opt.RintnullableExpIc1? Total exposure time in Ic filtermintime.duration;obs.exposure;em.opt.IintnullableExpIc2? Total exposure time in Ic filtermintime.duration;obs.exposure;em.opt.IintnullableJ/A+A/402/113/table4List of 26 Cepheids observed in our study with their characteristic parametersn_ID[*+] Note on ID (1)meta.notecharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.maine_OPer? rms uncertainty on OPerdstat.errorfloatnullableIcFileName of the light curve file in Ic filtermeta.id;meta.filecharRcFileName of the light curve file in Rc filtermeta.id;meta.filecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification of variable star in our sample (V1 to V26)meta.id;meta.maincharDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainRcmagMean magnitude of the star in Rc filtermagphot.mag;em.opt.RfloatIcmagMean magnitude of the star in Ic filtermagphot.mag;em.opt.IfloatDeltaRcChange in magnitude of the star in Rc filtermagsrc.var.amplitudefloatPerPerioddtime.periodfloate_Perrms uncertainty on Perdstat.errorfloatAgeAgeMyrtime.ageinto_RcmagNumber of observations on Rc filtermeta.numberintANameOther identification (2)meta.idcharOPer? Period given in the cataloguesdtime.periodfloatnullableJ/A+A/402/113/table5The celestial coordinates of 333 variables detected during our observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentificaiton of variable star in our sample (VNNN, V27 to V359)meta.idcharRAJ2000Right ascension of the star (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of the star (J2000)degpos.eq.dec;meta.mainRcmagMean magnitude of the star in Rc filtermagphot.mag;em.opt.RfloatIcmagMean magnitude of the star in Ic filtermagphot.mag;em.opt.IfloatDeltaRcChange in magnitude of the star in Rc filtermagsrc.var.amplitudefloatPerPeriod, if it is a periodic variabledtime.periodcharTypeNature of the star as given in SIMBAD cataloguesrc.classchar