J/A+A/626/A128ivo://CDS.VizieR/J/A+A/626/A128doi:10.26093/cds/vizier.36260128CDSEscorza A.Karinkuzhi D.Jorissen A.Siess L.Van Winckel H.,Pourbaix D.Johnston C.Miszalski B.Oomen G-M.Abdul-Masih M.Boffin H.M.J.North P.Manick R.Shetye S.Mikolajewska J.2019-07-26T12:49:27Z2019-07-01T07:23:35ZCDS support team

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

cds-question@unistra.frbarium-starswhite-dwarf-starsstellar-massesspectroscopic-binary-starsBarium (Ba) dwarfs and CH subgiants are the less evolved analogues of Ba and CH giants. They are F- to G-type main-sequence stars polluted with heavy elements by their binary companions when the companion was on the asymptotic giant branch (AGB). This companion is now a white dwarf that in most cases cannot be directly detected. We present a large systematic study of 60 objects classified as Ba dwarfs or CH subgiants. Combining radial-velocity measurements from HERMES and SALT high-resolution spectra with radial-velocity data from CORAVEL and CORALIE, we determine the orbital parameters of 27 systems. We also derive their masses by comparing their location in the Hertzsprung-Russell diagram with evolutionary models. We confirm that Ba dwarfs and CH subgiants are not at different evolutionary stages, and that they have similar metallicities, despite their different names. Additionally, Ba giants appear significantly more massive than their main-sequence analogues. This is likely due to observational biases against the detection of hotter main- sequence post-mass-transfer objects. Combining our spectroscopic orbits with the Hipparcos astrometric data, we derive the orbital inclination and the mass of the WD companion for four systems. Since this cannot be done for all systems in our sample yet (but should be possible with upcoming Gaia data releases), we also analyse the mass-function distribution of our binaries. We can model this distribution with very narrow mass distributions for the two components and random orbital orientations on the sky. Finally, based on BINSTAR evolutionary models, we suggest that the orbital evolution of low-mass Ba systems can be affected by a second phase of interactions along the red giant branch of the Ba star, which impact the eccentricities and periods of the giants.2019A&A...626A.128Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/626/A128CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/626/A127 : Barium and related stars and WD companions (Jorissen+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/626/A128https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/626/A128http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/626/A128https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/626/A128https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/626/A128http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/626/A128GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/626/A128/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/626/A128/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/626/A128/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/626/A128/stars?GETtext/xml+votable180.050000true356.733519.47280560.0055555555555555566/706 3408 5531 7238 9274 13620 16399 17289 17409 17763 19547 20057 20110 23050 24003 24160 25008 25198 25363 25869 25950 25984 26655 30779 32086 33023 33310 33621 33834 35442 37452 38164 38219 38792 38806 39851 39926 40139 41619 41813 42218 42964 43255 43321 43562 43577 43649 44196 44851 45301 45837 46156 46442 46626 47396 47761 48411https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/626/A128?format=asciidefaultJ/A+A/626/A128/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharRAJ2000Simbad Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Declination (J2000)pos.eq.dec;meta.mainVCShow the Radial Velocity curvesmeta.ref.urlcharJ/A+A/626/A128/rvdataRadial velocity data of Ba dwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleRVRadial-velocity measurementkm/sphys.veloc;pos.heliocentricfloate_RVError on the RV valuekm/sstat.errorfloatInstInstrumentmeta.id;instrcharOffset? Proposed offset to CORAVEL data (1)km/sphys.veloc;arith.difffloatnullable