J/A+A/528/A21ivo://CDS.VizieR/J/A+A/528/A21doi:10.26093/cds/vizier.35280021CDSPribulla T.Merand A.Kervella P.Vanko M.Stevens I.R.Chini R.,Hoffmeister V.Stahl O.Berndt A.Mugrauer M.Ammler-von Eiff M.2023-09-25T06:02:23Z2011-02-28T09:45:49ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsspectroscopyThe nearby multiple system delta Velorum contains a widely detached eclipsing binary and a third component. We take advantage of this system offering the opportunity to determine the set of fundamental parameters (masses, luminosities, and radii) of three coeval stars with sufficient precision to test models of stellar evolution. Extensive high-resolution spectroscopy is analyzed by the broadening function technique to provide the first spectroscopic orbit of the eclipsing pair. Simultaneous analysis of the spectroscopic data and the SMEI satellite light curve is performed to provide astrophysical parameters for the components. We use a modified Roche model assuming an eccentric orbit and asynchronous rotation. The observations show that components of the eclipsing pair rotate at about two-thirds of the break-up velocity, which excludes any chemical peculiarity and results in a non-uniform surface brightness. Although the inner orbit is eccentric, no apsidal motion is seen during the SMEI photometric observations. For the inner orbit, the orbital parameters are eccentricity e=0.290, longitude of the periastron passage omega=109{deg}, and inclination 89.0{deg}. The component masses of M(Aa)=2.53+/-0.11M_{sun}_, M(Ab)=2.37+/-0.10M_{sun}_, and M(B)~1.5M_{sun}_ combined with the inferred radii of the Aa and Ab components indicate that the eclipsing pair has already left the main sequence and that the estimated age of the system is about 400Myr.2011A&A...528A..21Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/528/A21CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/528/A21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/528/A21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/528/A21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/528/A21https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/528/A21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/528/A21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/528/A21defaultJ/A+A/528/A21/table1Journal of spectroscopic observations at Cerro Armazones ObservatoryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFileNameName of the FITS spectrum in subdirectory spmeta.id;meta.fitscharBJDBaricentric Julian date of mid-exposuredtime.epochdoublePhasePhase of mid-exposure (1)time.phasefloatS/NSignal to noise ratio (2)stat.snrintExpTimeExposure timestime.duration;obs.exposureintspPlot of the spectrum in the {lambda} range 375-890nmmeta.ref.urlchar