J/A+A/509/A70ivo://CDS.VizieR/J/A+A/509/A70doi:10.26093/cds/vizier.35090070CDSVilardell F.Ribas I.Jordi C.Fitzpatrick E.L.Guinan E.F.2017-06-28T06:58:27Z2010-03-29T07:57:29ZCDS support team

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

cds-question@unistra.frgalaxieseclipsing-binary-starsradial-velocityThe cosmic distance scale largely depends on distance determinations to galaxies of the Local Group. In this sense, the Andromeda galaxy (M31) is a key rung to better constrain the cosmic distance ladder. A project was started in 1999 to firmly establish a direct and accurate distance to M31 using eclipsing binaries (EBs). After the determination of the first direct distance to M31 from EBs, the second direct distance to an EB system is presented: M31V J00443610+4129194. Light and radial velocity curves were obtained and fitted to derive the masses and radii of the components. The acquired spectra were combined and disentangled to determine the temperature of the components. The analysis of the studied EB resulted in a distance determination to M31 of (m-M)0=24.30+/-0.11mag. This result, when combined with the previous distance determination to M31, results in a distance modulus of (m-M)0=24.36+/-0.08mag (744+/-33kpc), fully compatible with other distance determinations to M31. With an error of only project.2010A&A...509A..70Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/509/A70CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/509/A70https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/509/A70http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/509/A70https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/509/A70https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/509/A70http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/509/A70GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/509/A70/table1Radial velocities of M31V_J00443610+4129194HJDHeliocentric Julian datetime.epochdoubleExpTimeExposure timestime.duration;obs.exposureintS/NSignal-to-noise ratiostat.snrintPhaseOrbital phasetime.phasefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRVp? Radial velocity for primarykm/sspect.dopplerVelocfloatnullablee_RVp? Radial velocity error for primarykm/sstat.errorfloatnullableRVs? Radial velocity for secondarykm/sspect.dopplerVelocfloatnullablee_RVs? Radial velocity error for secondarykm/sstat.errorfloatnullable