J/MNRAS/436/953ivo://CDS.VizieR/J/MNRAS/436/953doi:10.26093/cds/vizier.74360953CDSPilecki B.Graczyk D.Pietrzynski G.Gieren W.Thompson I.B.,Freedman W.L.Scowcroft V.Madore B.F.Udalski A.Soszynski I.,Konorski P.Smolec R.Nardetto N.Bono G.Prada Moroni P.G.Storm J.,Gallenne A.2024-08-07T20:12:11Z2015-03-05T09:10:25ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyphotometrymillimeter-astronomysubmillimeter-astronomyA novel method of analysis of double-lined eclipsing binaries containing a radially pulsating star is presented. The combined pulsating-eclipsing light curve is built up from a purely eclipsing light-curve grid created using an existing modelling tool. For every pulsation phase, the instantaneous radius and surface brightness are taken into account, being calculated from the disentangled radial velocity curve of the pulsating star and from its out-of-eclipse pulsational light curve and the light ratio of the components, respectively. The best model is found using the Markov chain Monte Carlo method. The method is applied to the eclipsing binary Cepheid OGLE-LMC-CEP-0227 (P_puls_=3.80d, P_orb_=309d). We analyse a set of new spectroscopic and photometric observations for this binary, simultaneously fitting OGLE V-band, I-band and Spitzer 3.6{mu}m photometry. We derive a set of fundamental parameters of the system significantly improving the precision comparing to the previous results obtained by our group. The Cepheid mass and radius are M_1_=4.165+/-0.032M_{sun}_ and R_1_=34.92+/-0.34R{sun}, respectively. For the first time a direct, geometrical and distance-independent determination of the Cepheid projection factor is presented. The value p=1.21+/-0.03(stat.)+/-0.04(syst.) is consistent with theoretical expectations for a short-period Cepheid and interferometric measurements for {delta} Cep. We also find a very high value of the optical limb darkening coefficients for the Cepheid component, in strong disagreement with theoretical predictions for static atmospheres at a given surface temperature and gravity.2013MNRAS.436..953Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/436/953CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/436/953https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/436/953http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/436/953https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/436/953https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/436/953http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/436/953GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap5.0053231178386525e-20 3.852589004194616e-19OpticalInfraredRadiodefaultJ/MNRAS/436/953/table1OGLE LMC-CEP-227 OGLE I-band photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2450000)dtime.epochdoubleImagOGLE I magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Imag (G1)magstat.error;phot.mag;em.opt.IfloatJ/MNRAS/436/953/table2OGLE LMC-CEP-227 OGLE V-band photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2450000)dtime.epochdoubleVmagOGLE V magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmag (G1)magstat.error;phot.mag;em.opt.VfloatJ/MNRAS/436/953/table3OGLE LMC-CEP-227 Spitzer 3.6um photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2450000)dtime.epochdouble[3.6]Spitzer/IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]rms uncertainty on [3.6] (G1)magstat.errorfloatJ/MNRAS/436/953/table4RV measurements of OGLE LMC-CEP-227recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2450000)dtime.epochdoubleInst[ab] Instrument: a=HARPS, b=UVESmeta.notecharRV1Orbital radial velocity of the primarykm/sspect.dopplerVelocfloatRV2Orbital radial velocity of the secondarykm/sspect.dopplerVelocfloatRVpPulsation radial velocitykm/sspect.dopplerVelocfloat