J/A+A/618/A5ivo://CDS.VizieR/J/A+A/618/A5doi:10.26093/cds/vizier.36180005CDSDurkan S.Janson M.Ciceri S.Brandner W.Schlieder J.,Henning T.Bonnefoy M.Kankare J.Watson C.A.2018-11-05T10:52:51Z2018-10-03T08:10:11ZCDS support team

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

cds-question@unistra.frmultiple-starslate-type-starspre-main-sequence-starsradial-velocityThe identification and characterisation of low-mass binaries is of importance for a range of astrophysical investigations. Low-mass binaries in young (~10-100Myr) moving groups (YMGs) in the solar neighborhood are of particular significance as they provide unique opportunities to calibrate stellar models and evaluate the ages and coevality of the groups themselves. Low-mass M-dwarfs have pre-main sequence life times on the order of ~100Myr and therefore are continually evolving along a mass-luminosity track throughout the YMG phase, providing ideal laboratories for precise isochronal dating, if a model-independent dynamical mass can be measured. AstraLux lucky imaging multiplicity surveys have recently identified hundreds of new YMG low-mass binaries, where a subsample of M-dwarf multiples have estimated orbital periods less than 50 years. We have conducted a radial velocity survey of a sample of 29 such targets to complement the astrometric data. This will allow enhanced orbital determinations and precise dynamical masses to be derived in a shorter timeframe than possible with astrometric monitoring alone, and allow for a more reliable isochronal analysis. Here we present radial velocity measurements derived for our sample over several epochs. We report the detection of the three-component spectroscopic multiple 2MASS J05301858-5358483, for which the C component is a new discovery, and forms a tight pair with the B component. Originally identified as a YMG member, we find that this system is a likely old field interloper, whose high chromospheric activity level is caused by tidal spin-up of the tight BC pair. Two other triple systems with a tight pair exist in the sample, 2MASS J04244260-0647313 (previously known) and 2MASS J20163382-0711456, but for the rest of the targets we find that additional tidally synchronized companions are highly unlikely, providing further evidence that their high chromospheric activity levels are generally signatures of youth.2018A&A...618A...5Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/618/A5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/618/A5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/618/A5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/618/A5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/618/A5https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/618/A5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/618/A5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/618/A5/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A5/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A5/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A5/stars?GETtext/xml+votable180.050000true17.855916715.43927780.0055555555555555566/850 4869 18743 19777 20074 20262 20701 21277 22731 22773 22830 22856 24629 29958 33116 33882 35154 36755 36978 37013 37418 38054 38359 39829 40148 41505 41568 44317 49146https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/618/A5?format=asciidefaultJ/A+A/618/A5/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (JHHMMSSss+DDMMSss)meta.id;meta.maincharRAJ2000Rigth ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainObsDisplay the observations in table2meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/618/A5/table2Radial velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (JHHMMSSss+DDMMSSs)phys.veloc;pos.heliocentriccharEpochEpoch (MJD)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVError on radial velocitykm/sstat.errorfloatn_RV[*] Note on RV (1)meta.notecharl_fcLimit flag on fcmeta.code.errorcharfc? Synchronizer detectability (see Sect 4.3)stat.fit.paramfloatnullableNotesTarget notes (2)meta.notechar