J/A+A/354/881ivo://CDS.VizieR/J/A+A/354/881doi:10.26093/cds/vizier.33540881CDSDebernardi Y.Mermilliod J.-C.Carquillat J.-M.Ginestet N.2024-08-06T20:00:24Z2004-10-15T11:00:10ZCDS support team

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

cds-question@unistra.fropen-star-clustersspectroscopic-binary-starsam-starsradial-velocityCORAVEL radial-velocity observations of Am stars in the Hyades and Praesepe have allowed the determination of orbital elements for 10 spectroscopic binaries, among which 3 are first determinations. One Am star (KW 40) is found to be a well hierarchised triple system. KW 538 has a rather long period (435 days) for an Am star. Orbits of systems with periods shorter than 8.5 days are circularized, or present eccentricities smaller than 0.04. For 19 Am stars, the number of quadruple-, triple-, double-, single systems is 1:2:14(10+4?):(2?). The Am stars in a ({beta}, B-V) diagram clearly stand away by 0.03mag from the sequence defined by normal main-sequence stars. This diagram could be a powerful method to identify Am stars in more distant open clusters, provided there is no differential reddening. In the colour-magnitude diagram (M_V_, {beta}), double-lined binaries are 0.6-0.7mag above the ZAMS as expected, while most single-lined are close to or on the ZAMS because the secondary does not contribute much light. The absence of X-ray detection of 4 systems in the Hyades is an argument for the presence of a white dwarf secondary.2000A&A...354..881Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/354/881CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/354/881https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/354/881http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/354/881https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/354/881https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/354/881http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/354/881GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/354/881/stars (List of stars (from table 1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/354/881/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/354/881/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/354/881/stars?GETtext/xml+votable180.050000true65.51458314.0772220.005555555555555556Cone search capability for table J/A+A/354/881/table2 (Individual radial velocities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/354/881/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/354/881/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/354/881/table2?GETtext/xml+votable180.050000true6/4687 4698 4720 23383 23526 23537 23546 23658 243151.398457827073138e-19 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/354/881?format=asciidefaultJ/A+A/354/881/starsList of stars (from table 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainVmagJohnson blue magnitudemagphot.mag;em.opt.VfloatB-VJohnson color indexmagphot.color;em.opt.B;em.opt.VfloatSpTypeMK spectral typesrc.spTypecharPeriodPerioddtime.perioddoubleRemarkRemark about duplicitymeta.notecharPlotPlot of the radial velocity vs Phasemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/354/881/table2Individual radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHenry Draper Catalog (Cat. <III/135>) numbermeta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleRVBarycentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_RVInternal estimate of velocity errorkm/sstat.errorfloatCompComponent of the binary systemmeta.code.multipchar