J/MNRAS/369/723ivo://CDS.VizieR/J/MNRAS/369/723doi:10.26093/cds/vizier.73690723CDSNgeow C.Kanbur S.M2024-07-02T20:17:44Z2007-12-05T23:58:04ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryThe superb phase resolution and quality of the OGLE data on LMC and SMC Cepheids, together with existing data on Galactic Cepheids, are combined to study the period-colour (PC) and amplitude-colour (AC) relations as a function of pulsation phase. Our results confirm earlier work that the LMC PC relation (at mean light) is more consistent with two lines of differing slopes, separated at a period of 10 days. However, our multi-phase PC relations reveal much new structure which can potentially increase our understanding of Cepheid variables. These multi-phase PC relations provide insight into why the Galactic PC relation is linear but the LMC PC relation is non-linear. This is because the LMC PC relation is shallower for short (logP<1) and steeper for long (logP>1) period Cepheids than the corresponding Galactic PC relation. Both of the short and long period Cepheids in all three galaxies exhibit the steepest and shallowest slopes at phases around 0.75-0.85, respectively. A consequence is that the PC relation at phase ~0.8 is highly non-linear. Further, the Galactic and LMC Cepheids with logP>1 display a flat slope in the PC plane at phases close to the maximum light. When the LMC period- luminosity (PL) relation is studied as a function of phase, we confirm that it changes with the PC relation. The LMC PL relation in V- and I-band near the phase of 0.8 provides compelling evidence that this relation is also consistent with two lines of differing slopes joined at a period close to 10 days.2006MNRAS.369..723Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/369/723CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/49/543 : OGLE LMC + SMC Cepheids VI photometry (Pietrzynski+, 1999)J/AcA/49/437 : BVI photometry of OGLE SMC Cepheids (Udalski+, 1999)J/AcA/49/223 : BVI photometry of OGLE LMC Cepheids (Udalski+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/369/723https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/369/723http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/369/723https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/369/723https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/369/723http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/369/723GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/369/723/tablea1 (V-band Fourier parameters for the Galactic Cepheid)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/369/723/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/369/723/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/369/723/tablea1?GETtext/xml+votable180.050000true286.16423391.30615560.005555555555555556Cone search capability for table J/MNRAS/369/723/tablea3 (V-band Fourier parameters for the LMC Cepheid)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/369/723/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/369/723/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/369/723/tablea3?GETtext/xml+votable180.050000true82.9550417-70.14838890.005555555555555556Cone search capability for table J/MNRAS/369/723/tablea5 (V-band Fourier parameters for the SMC Cepheid)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/369/723/tablea5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/369/723/tablea5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/369/723/tablea5?GETtext/xml+votable180.050000true9.2322917-73.94097220.0055555555555555565/8272 8274 6/1239 1426 1431 1920 3000 3005 3045 3255 3261 3342 3361 3600 3616 3627 3656 12934 12971 12987 13201 13288 13309-13310 13931 13933 13990 14047 14205 14238 14260 14262 14267 14271 14283 14295 14303 14321 14323 14328 14404 14409 14424 14436 14445 14455 14601 14637 14709 14718 15360 15388 15461 15618 15633 21514 21542 21648 22071 22219 23622 23654 23778 23852 23922 23936 24002 24326 24372 24411 28717 28779 28808 28819 28831 28875 28893 28991 29032 29081 29104 29126 29166 29216 29897 30128 30211 30222-30223 30235 30245 30270 30321-30322 30504 30609 30641 30646 33051 33053-33054 33073 33076-33077 33106 33108 33113 33120-33121 33294-33295 33304 33306 33316-33317 33328 33804 37330 37332 37334 37340 37357 37364 37674 37721 37723 37729 37828-37829 37856 37859 37870 37903 37923 37931 37938 38020 38022 38026 38049 39232 39348 39374 39410 39771 39889 39933 40494 41375 41385 41461 41556 41605 41608 41673 41681 41722 41737 41762 41768 41813 41862 42156 42297 42445 42820 43013 43028 43056 43060https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/369/723?format=asciiOpticaldefaultJ/MNRAS/369/723/tablea1V-band Fourier parameters for the Galactic CepheidrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid identification (1)meta.id;meta.maincharE(B-V)Extinction valuemagphot.color.excessfloatlog(P)Log periodlog(d)time.perioddoubleA0V or I band mean magnitudemagphot.mag;em.opt.VfloatA1Fourier amplitude A1magstat.fit.paramfloatphi1Fourier phase phi1radstat.fit.paramfloatA2Fourier amplitude A2magstat.fit.paramfloatphi2Fourier phase phi2radstat.fit.paramfloatA3Fourier amplitude A3magstat.fit.paramfloatphi3Fourier phase phi3radstat.fit.paramfloatA4? Fourier amplitude A4magstat.fit.paramfloatnullablephi4? Fourier phase phi4radstat.fit.paramfloatnullableA5? Fourier amplitude A5magstat.fit.paramfloatnullablephi5? Fourier phase phi5radstat.fit.paramfloatnullableA6? Fourier amplitude A6magstat.fit.paramfloatnullablephi6? Fourier phase phi6radstat.fit.paramfloatnullableA7? Fourier amplitude A7magstat.fit.paramfloatnullablephi7? Fourier phase phi7radstat.fit.paramfloatnullableA8? Fourier amplitude A8magstat.fit.paramfloatnullablephi8? Fourier phase phi8radstat.fit.paramfloatnullableA9? Fourier amplitude A9magstat.fit.paramfloatnullablephi9? Fourier phase phi9radstat.fit.paramfloatnullableA10? Fourier amplitude A10magstat.fit.paramfloatnullablephi10? Fourier phase phi10radstat.fit.paramfloatnullableA11? Fourier amplitude A11magstat.fit.paramfloatnullablephi11? Fourier phase phi11radstat.fit.paramfloatnullableA12? Fourier amplitude A12magstat.fit.paramfloatnullablephi12? Fourier phase phi12radstat.fit.paramfloatnullableSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/369/723/tablea2I-band Fourier parameters for the Galactic CepheidrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid identification (1)meta.id;meta.maincharE(B-V)Extinction valuemagphot.color.excessfloatlog(P)Log periodlog(d)time.perioddoubleA0V or I band mean magnitudemagphot.mag;em.opt.IfloatA1Fourier amplitude A1magstat.fit.paramfloatphi1Fourier phase phi1radstat.fit.paramfloatA2Fourier amplitude A2magstat.fit.paramfloatphi2Fourier phase phi2radstat.fit.paramfloatA3Fourier amplitude A3magstat.fit.paramfloatphi3Fourier phase phi3radstat.fit.paramfloatA4? Fourier amplitude A4magstat.fit.paramfloatnullablephi4? Fourier phase phi4radstat.fit.paramfloatnullableA5? Fourier amplitude A5magstat.fit.paramfloatnullablephi5? Fourier phase phi5radstat.fit.paramfloatnullableA6? Fourier amplitude A6magstat.fit.paramfloatnullablephi6? Fourier phase phi6radstat.fit.paramfloatnullableA7? Fourier amplitude A7magstat.fit.paramfloatnullablephi7? Fourier phase phi7radstat.fit.paramfloatnullableA8? Fourier amplitude A8magstat.fit.paramfloatnullablephi8? Fourier phase phi8radstat.fit.paramfloatnullableA9? Fourier amplitude A9magstat.fit.paramfloatnullablephi9? Fourier phase phi9radstat.fit.paramfloatnullableA10? Fourier amplitude A10magstat.fit.paramfloatnullablephi10? Fourier phase phi10radstat.fit.paramfloatnullableA11? Fourier amplitude A11magstat.fit.paramfloatnullablephi11? Fourier phase phi11radstat.fit.paramfloatnullableA12? Fourier amplitude A12magstat.fit.paramfloatnullablephi12? Fourier phase phi12radstat.fit.paramfloatnullableJ/MNRAS/369/723/tablea3V-band Fourier parameters for the LMC CepheidrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid identification (1)meta.id;meta.maincharE(B-V)Extinction valuemagphot.color.excessfloatlog(P)Log periodlog(d)time.perioddoubleA0V or I band mean magnitudemagphot.mag;em.opt.VfloatA1Fourier amplitude A1magstat.fit.paramfloatphi1Fourier phase phi1radstat.fit.paramfloatA2Fourier amplitude A2magstat.fit.paramfloatphi2Fourier phase phi2radstat.fit.paramfloatA3Fourier amplitude A3magstat.fit.paramfloatphi3Fourier phase phi3radstat.fit.paramfloatA4? Fourier amplitude A4magstat.fit.paramfloatnullablephi4? Fourier phase phi4radstat.fit.paramfloatnullableA5? Fourier amplitude A5magstat.fit.paramfloatnullablephi5? Fourier phase phi5radstat.fit.paramfloatnullableA6? Fourier amplitude A6magstat.fit.paramfloatnullablephi6? Fourier phase phi6radstat.fit.paramfloatnullableA7? Fourier amplitude A7magstat.fit.paramfloatnullablephi7? Fourier phase phi7radstat.fit.paramfloatnullableA8? Fourier amplitude A8magstat.fit.paramfloatnullablephi8? Fourier phase phi8radstat.fit.paramfloatnullableA9? Fourier amplitude A9magstat.fit.paramfloatnullablephi9? Fourier phase phi9radstat.fit.paramfloatnullableA10? Fourier amplitude A10magstat.fit.paramfloatnullablephi10? Fourier phase phi10radstat.fit.paramfloatnullableA11? Fourier amplitude A11magstat.fit.paramfloatnullablephi11? Fourier phase phi11radstat.fit.paramfloatnullableA12? Fourier amplitude A12magstat.fit.paramfloatnullablephi12? Fourier phase phi12radstat.fit.paramfloatnullableOGLEData from J/AcA/49/223meta.ref.urlchar_RAPosition from OGLE catalogues (right ascension part)degpos.eq.ra;meta.main_DEPosition from OGLE catalogues (declination part)degpos.eq.dec;meta.mainJ/MNRAS/369/723/tablea4I-band Fourier parameters for the LMC CepheidrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid identification (1)meta.id;meta.maincharE(B-V)Extinction valuemagphot.color.excessfloatlog(P)Log periodlog(d)time.perioddoubleA0V or I band mean magnitudemagphot.mag;em.opt.IfloatA1Fourier amplitude A1magstat.fit.paramfloatphi1Fourier phase phi1radstat.fit.paramfloatA2Fourier amplitude A2magstat.fit.paramfloatphi2Fourier phase phi2radstat.fit.paramfloatA3Fourier amplitude A3magstat.fit.paramfloatphi3Fourier phase phi3radstat.fit.paramfloatA4? Fourier amplitude A4magstat.fit.paramfloatnullablephi4? Fourier phase phi4radstat.fit.paramfloatnullableA5? Fourier amplitude A5magstat.fit.paramfloatnullablephi5? Fourier phase phi5radstat.fit.paramfloatnullableA6? Fourier amplitude A6magstat.fit.paramfloatnullablephi6? Fourier phase phi6radstat.fit.paramfloatnullableA7? Fourier amplitude A7magstat.fit.paramfloatnullablephi7? Fourier phase phi7radstat.fit.paramfloatnullableA8? Fourier amplitude A8magstat.fit.paramfloatnullablephi8? Fourier phase phi8radstat.fit.paramfloatnullableA9? Fourier amplitude A9magstat.fit.paramfloatnullablephi9? Fourier phase phi9radstat.fit.paramfloatnullableA10? Fourier amplitude A10magstat.fit.paramfloatnullablephi10? Fourier phase phi10radstat.fit.paramfloatnullableA11? Fourier amplitude A11magstat.fit.paramfloatnullablephi11? Fourier phase phi11radstat.fit.paramfloatnullableA12? Fourier amplitude A12magstat.fit.paramfloatnullablephi12? Fourier phase phi12radstat.fit.paramfloatnullableJ/MNRAS/369/723/tablea5V-band Fourier parameters for the SMC CepheidrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid identification (1)meta.id;meta.maincharE(B-V)Extinction valuemagphot.color.excessfloatlog(P)Log periodlog(d)time.perioddoubleA0V or I band mean magnitudemagphot.mag;em.opt.VfloatA1Fourier amplitude A1magstat.fit.paramfloatphi1Fourier phase phi1radstat.fit.paramfloatA2Fourier amplitude A2magstat.fit.paramfloatphi2Fourier phase phi2radstat.fit.paramfloatA3Fourier amplitude A3magstat.fit.paramfloatphi3Fourier phase phi3radstat.fit.paramfloatA4? Fourier amplitude A4magstat.fit.paramfloatnullablephi4? Fourier phase phi4radstat.fit.paramfloatnullableA5? Fourier amplitude A5magstat.fit.paramfloatnullablephi5? Fourier phase phi5radstat.fit.paramfloatnullableA6? Fourier amplitude A6magstat.fit.paramfloatnullablephi6? Fourier phase phi6radstat.fit.paramfloatnullableA7? Fourier amplitude A7magstat.fit.paramfloatnullablephi7? Fourier phase phi7radstat.fit.paramfloatnullableA8? Fourier amplitude A8magstat.fit.paramfloatnullablephi8? Fourier phase phi8radstat.fit.paramfloatnullableA9? Fourier amplitude A9magstat.fit.paramfloatnullablephi9? Fourier phase phi9radstat.fit.paramfloatnullableA10? Fourier amplitude A10magstat.fit.paramfloatnullablephi10? Fourier phase phi10radstat.fit.paramfloatnullableA11? Fourier amplitude A11magstat.fit.paramfloatnullablephi11? Fourier phase phi11radstat.fit.paramfloatnullableA12? Fourier amplitude A12magstat.fit.paramfloatnullablephi12? Fourier phase phi12radstat.fit.paramfloatnullableOGLEData from J/AcA/49/223meta.ref.urlchar_RAPosition from OGLE catalogues (right ascension part)degpos.eq.ra;meta.main_DEPosition from OGLE catalogues (declination part)degpos.eq.dec;meta.mainJ/MNRAS/369/723/tablea6I-band Fourier parameters for the SMC Cepheidphi4? Fourier phase phi4radstat.fit.paramfloatnullableA5? Fourier amplitude A5magstat.fit.paramfloatnullablephi5? Fourier phase phi5radstat.fit.paramfloatnullableA6? Fourier amplitude A6magstat.fit.paramfloatnullablephi6? Fourier phase phi6radstat.fit.paramfloatnullableA7? Fourier amplitude A7magstat.fit.paramfloatnullablephi7? Fourier phase phi7radstat.fit.paramfloatnullableA8? Fourier amplitude A8magstat.fit.paramfloatnullablephi8? Fourier phase phi8radstat.fit.paramfloatnullableA9? Fourier amplitude A9magstat.fit.paramfloatnullablephi9? Fourier phase phi9radstat.fit.paramfloatnullableA10? Fourier amplitude A10magstat.fit.paramfloatnullablephi10? Fourier phase phi10radstat.fit.paramfloatnullableA11? Fourier amplitude A11magstat.fit.paramfloatnullablephi11? Fourier phase phi11radstat.fit.paramfloatnullableA12? Fourier amplitude A12magstat.fit.paramfloatnullablephi12? Fourier phase phi12radstat.fit.paramfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid identification (1)meta.id;meta.maincharE(B-V)Extinction valuemagphot.color.excessfloatlog(P)Log periodlog(d)time.perioddoubleA0V or I band mean magnitudemagphot.mag;em.opt.IfloatA1Fourier amplitude A1magstat.fit.paramfloatphi1Fourier phase phi1radstat.fit.paramfloatA2Fourier amplitude A2magstat.fit.paramfloatphi2Fourier phase phi2radstat.fit.paramfloatA3Fourier amplitude A3magstat.fit.paramfloatphi3Fourier phase phi3radstat.fit.paramfloatA4? Fourier amplitude A4magstat.fit.paramfloatnullable