J/A+A/415/145ivo://CDS.VizieR/J/A+A/415/145doi:10.26093/cds/vizier.34150145CDSBoeche C.Munari U.Tomasella L.Barbon R.2017-07-04T07:09:05Z2004-04-10T16:19:02ZCDS support team

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

cds-question@unistra.fropen-star-clustersearly-type-starseclipsing-binary-starsradial-velocityBetween 1996 and 2003 we obtained 226 high resolution spectra of 16 stars in the field of the young open cluster NGC 6913, to constrain its main properties and study its internal kinematics. Twelve of the program stars turned out to be members, one of them probably unbound. Nine are binaries (one eclipsing and another double lined) and for seven of them the observations allowed us to derive the orbital elements. All but two of the nine discovered binaries are cluster members. In spite of the young age (a few Myr), the cluster already shows signs that could be interpreted as evidence of dynamical relaxation and mass segregation. However, they may be also the result of an unconventional formation scenario. The dynamical (virial) mass as estimated from the radial velocity dispersion is larger than the cluster luminous mass, which may be explained by a combination of the optically thick interstellar cloud that occults part of the cluster, the unbound state or undetected very wide binary orbit of some of the members that inflate the velocity dispersion and a high inclination for the axis of possible cluster angular momentum. All the discovered binaries are hard enough to survive average close encounters within the cluster and do not yet show signs of relaxation of the orbital elements to values typical of field binaries.2004A&A...415..145Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/415/145CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/343/806 : The trapezium system BD+00 1617 (Munari+ 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/415/145https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/415/145http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/415/145https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/415/145https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/415/145http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/415/145GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/415/145/stars (Star positions (from Simbad))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/415/145/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/415/145/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/415/145/stars?GETtext/xml+votable180.050000true305.962538.4927780.0055555555555555566/14645https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/415/145?format=asciiOpticaldefaultJ/A+A/415/145/starsStar positions (from Simbad)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.idintprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainHIP/TYCHIP or TYC designationmeta.idcharNameOther namemeta.id;meta.maincharPlotPlot of the radial velocity vs timemeta.refcharSimbadSimbad column added by the CDSmeta.refcharJ/A+A/415/145/table4Epoch radial velocities of the program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar number as given in the papermeta.idintm_Seq[AB] Multiplicity index on Seqmeta.code.multipcharHJDEpoch of observation in heliocentric Julian daysdtime.epochdoubleHRVHeliocentric radial velocitykm/sphys.veloc;pos.heliocentricfloate_HRVrms uncertainty on HRVkm/sstat.errorfloat