J/A+A/639/A7ivo://CDS.VizieR/J/A+A/639/A7doi:10.26093/cds/vizier.36390007CDSJorissen A.Van Winckel H.Siess L.Escorza A.Pourbaix D.Van Eck S.2022-09-07T09:16:46Z2020-07-01T07:48:30ZCDS support team

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

cds-question@unistra.frk-starsgiant-starsspectroscopic-binary-starsradial-velocityThe origin of the Li-rich K giants is still highly debated. Here, we investigate the incidence of binarity among this family from a nine-year radial-velocity monitoring of a sample of 11 Li-rich K giants using the HERMES spectrograph attached to the 1.2m Mercator Telescope. A sample of 13 non-Li-rich giants (8 of them being surrounded by dust according to IRAS, WISE, and ISO data) was monitored alongside. When compared to the binary frequency in a reference sample of 190K giants (containing 17.4% of definite spectroscopic binaries - SB - and 6.3% of possible spectroscopic binaries - SB?), the binary frequency appears normal among the Li-rich giants (2/11 definite binaries plus 2 possible binaries, or 18.2% SB + 18.2% SB?), after taking account of the small sample size through the hypergeometric probability distribution. Therefore, there appears to be no causal relationship between Li enrichment and binarity. Moreover, there is no correlation between Li enrichment and the presence of circumstellar dust, and the only correlation that could be found between Li enrichment and rapid rotation is that the most Li-enriched K giants appear to be fast-rotating stars. However, among the dusty K giants, the binary frequency is much higher (4/8 definite binaries plus 1 possible binary). The remaining 3 dusty K giants suffer from a radial-velocity jitter, as is expected for the most luminous K giants, which these are.2020A&A...639A...7Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/639/A7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/430/165 : Radial velocities for 6691 K and M giants (Famaey+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/639/A7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/639/A7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/639/A7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/639/A7https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/639/A7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/639/A7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/639/A7/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/639/A7/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/639/A7/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/639/A7/stars?GETtext/xml+votable180.050000true1.2659167-0.50302780.005555555555555556Cone search capability for table J/A+A/639/A7/tablea2 (R (Kepler and CoRoT K giants) and its binary properties (see Sect. 5.1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/639/A7/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/639/A7/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/639/A7/tablea2?GETtext/xml+votable180.050000true290.88659536.87241470.0055555555555555565/3646 3690 3730 3732 6/1408 2839 7103 7332 7487 13641 14559 14567 14573 14575 14577-14582 14588 14591 14730-14731 14733-14734 14744 14750 14752 14754-14757 14767-14768 14771-14772 14774-14776 14794 14816 14914-14915 14918-14919 14924-14925 14932 14934 14936-14938 14944 14947-14948 14952 14958 14967 14972 15041 15057 15104 15107 15116 15118 15120-15121 15124 15136 16815 18088 18634 19824 20311 20921 21307 22293 23024 23341 24670 25608 25672 28149 29391 31017 359641.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/639/A7?format=asciidefaultJ/A+A/639/A7/starsList of studied starsHDHD number of target starmeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Simbad right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000.0)pos.eq.dec;meta.mainNobsNumber of RV measurements on rv.dat filemeta.numberintVCShow the Radial Velocity curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/639/A7/rvList of individual radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD number of target starmeta.id;meta.mainintJDJulian date (JD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVUncertainty on radial velocitykm/sstat.errorfloatJ/A+A/639/A7/tablea2R (Kepler and CoRoT K giants) and its binary properties (see Sect. 5.1)SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKIC/CoRoTKIC/Corot identification numbermeta.idlongsigmaj(RV)RV standard deviationkm/sstat.stdevfloatsigma(O-C)? Standard deviation of the O-C residuals (for systems with orbital solutions)km/sstat.stdev;stat.fit.omcfloatnullable<RVH>Mean HERMES radial velocitykm/sphys.veloc;pos.heliocentricfloatNobsHjNumber of HERMES RV observationsmeta.numberintDELTAtHERMES RV observations time spandtime.intervalchi2j/nujReduced chi2, with nuj=NobsHj-1stat.fit.chi2doubleProbAssociated probability that the star has a variable RVmeta.id.assoc;stat.probabilityfloatF2jF2 statisticstat.fit.paramfloat<RVG>? Mean Gaia DR2 radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablesigma<RVG>? Gaia DR2 radial velocity standard deviationkm/sstat.stdevfloatnullableeps(RVG)? Expected uncertainty on the Gaia DR2 RV (see Eq. (3))km/sstat.errorfloatnullable|<RVG>-<RVH>|? Velocity difference, HERMES - Gaia DR2km/sphys.veloc;arith.difffloatnullableGmag? Gaia DR2 G magnitudemagphot.mag;em.optfloatnullableGRVS? Gaia DR2 stellar magnitude GRVS in the Radial Velocity Spectrometer pass bandmagphot.mag;em.optfloatnullableSBFinal decision about binarity, from HERMES and Gaia DR2 data (1)meta.notechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable