J/AJ/144/55ivo://CDS.VizieR/J/AJ/144/55doi:10.26093/cds/vizier.51440055CDSMace G.N.Prato L.Torres G.Wasserman L.H.Mathieu R.D.McLean I.S.2017-07-03T14:25:50Z2013-10-11T09:45:52ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starspre-main-sequence-starsspectroscopyradial-velocityThe young, low-mass, triple system NTTS 155808-2219 (ScoPMS 20) was previously identified as a ~17day period single-lined spectroscopic binary (SB) with a tertiary component at 0.21arcsec. Using high-resolution infrared spectra, acquired with NIRSPEC on Keck II, both with and without adaptive optics (AO), we measured radial velocities (RVs) of all three components. Reanalysis of the single-lined visible light observations, made from 1987 to 1993, also yielded RV detections of the three stars. Combining visible light and infrared data to compute the orbital solution produces orbital parameters consistent with the single-lined solution and a mass ratio of q=0.78+/-0.01 for the SB. We discuss the consistency between our results and previously published data on this system, our RV analysis with both observed and synthetic templates, and the possibility that this system is eclipsing, providing a potential method for the determination of the stars' absolute masses. Over the ~20year baseline of our observations, we have measured the acceleration of the SB's center of mass in its orbit with the tertiary. Long-term, AO imaging of the tertiary will eventually yield dynamical data useful for component mass estimates.2012AJ....144...55Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/55CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/745/56 : Upper Sco members rotational velocities (Dahm+, 2012)J/AJ/124/1144 : Orbits of 171 single-lined spectroscop. binaries (Latham, 2002)J/A+A/376/982 : Near-IR observations of young binaries (Woitas+, 2001)J/A+A/369/249 : T Tauri binary systems orbital motion (Woitas+, 2001)J/AJ/120/479 : Low-mass stars in the Upper Sco association (Ardila+, 2000)J/A+A/356/541 : T Tauri stars in the Sco-Cen OB association (Koehler+, 2000)J/A+A/216/44 : Walraven photometry in Sco-Cen association (De Geus+, 1989)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/55https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/144/55/table2Visible light spectroscopic observations and radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of observationtime.epoch;obsnullableHJD[46955.7/54221] Heliocentric Julian Date (HJD-2400000)dtime.epochdoubleRV1[-42/30] Radial velocity of the primarykm/sspect.dopplerVelocfloate_RV1Uncertainty in RV1km/sstat.errorfloatRV2[-54/42]? Radial velocity of the secondarykm/sspect.dopplerVelocfloatnullablee_RV2? Uncertainty in RV2km/sstat.errorfloatnullableRV3[-12/3]? Radial velocity of the tertiarykm/sspect.dopplerVelocfloatnullablePhaseSpectroscopic binary phasetime.phasefloatJ/AJ/144/55/table3Infrared spectroscopic observations and radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of observationtime.epoch;obsnullablef_Date[ab] a = tertiary spectrum separated (1)meta.codecharHJD[46955.7/54221] Heliocentric Julian Date (HJD-2400000)dtime.epochdoubleRV1[-42/30] Radial velocity of the primarykm/sspect.dopplerVelocfloate_RV1Uncertainty in RV1km/sstat.errorfloatRV2[-54/42]? Radial velocity of the secondarykm/sspect.dopplerVelocfloatnullablee_RV2? Uncertainty in RV2km/sstat.errorfloatnullableRV3[-12/3]? Radial velocity of the tertiarykm/sspect.dopplerVelocfloatnullablePhaseSpectroscopic binary phasetime.phasefloat