J/A+A/369/249ivo://CDS.VizieR/J/A+A/369/249doi:10.26093/cds/vizier.33690249CDSWoitas J.Koehler R.Leinert C.2001-03-31T14:27:14Z2001-03-31T14:27:07ZCDS support team

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

cds-question@unistra.frorbitspre-main-sequence-starsvariable-starsUsing speckle-interferometry we have carried out repeated measurements of relative positions for the components of 34 T Tauri binary systems. The projected separation of these components is low enough that orbital motion is expected to be observable within a few years. In most cases orbital motion has indeed been detected. The observational data is discussed in a manner similar to Ghez et al. (1995AJ....110..753G). However, we extend their study to a larger number of objects and a much longer timespan. The database presented in this paper is valuable for future visual orbit determinations. It will yield empirical masses for T Tauri stars that now are only poorly known. The available data is however not sufficient to do this at the present time. Instead, we use short series of orbital data and statistical distributions of orbital parameters to derive an average system mass that is independent of theoretical assumptions about the physics of PMS stars. For our sample this mass is and thus in the order of magnitude one expects for the mass sum of two T Tauri stars. It is also comparable to mass estimates obtained for the same systems using theoretical PMS evolutionary models.2001A&A...369..249Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/369/249CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/369/249https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/369/249http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/369/249https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/369/249https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/369/249http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/369/249GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/369/249/stars (Star positions and magnitudes (from Simbad))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/369/249/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/369/249/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/369/249/stars?GETtext/xml+votable180.050000true66.77041718.20750.0055555555555555566/1039 1050 1052 1073 1075 1080 1082 1159 1168 23548-23550 36956 42714 44291 44301 44308 44360-44361 44363 44366 44378-44379 44385https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/369/249?format=asciidefaultJ/A+A/369/249/starsStar positions and magnitudes (from Simbad)NameObject namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNameSimbad designationmeta.idcharSimbadask the SIMBAD data-base about this objectmeta.refcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmag? B magnitudemagphot.mag;em.opt.BfloatnullableVmag? V magnitudemagphot.mag;em.opt.VfloatnullableSpTypeSpectral typesrc.spTypecharJ/A+A/369/249/tablea1Orbital elementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharOBSDate of observation (day)time.epochFiltFilter(s)meta.code;instr.filtercharI2/I1? Flux ratio of the 2 componentsphot.flux;arith.ratiofloatnullablee_I2/I1? Error of flux ratiostat.errorfloatnullablePA? Position angledegpos.posAngfloatnullablee_PA? Error of position angledegstat.errorfloatnullablerho? Separationmaspos.angDistancefloatnullablee_rho? Error of separationmasstat.errorintnullableRefBibcode of the referencemeta.refcharn_RefAuthor's name for the referencesmeta.bib.authorchar