J/AJ/152/213ivo://CDS.VizieR/J/AJ/152/213doi:10.26093/cds/vizier.51520213CDSSchaefer G.H.Hummel C.A.Gies D.R.Zavala R.T.Monnier J.D.,Walter F.M.Turner N.H.Baron F.ten Brummelaar T.Che X.,Farrington C.D.Kraus S.Sturmann J.Sturmann L.2017-06-21T08:22:35Z2017-03-06T13:27:23ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsinterferometryradial-velocityWe present interferometric observations of the {sigma} Orionis triple system using the CHARA Array, NPOI, and VLTI. Using these measurements, we spatially resolve the orbit of the close spectroscopic binary (Aa,Ab) for the first time and present a revised orbit for the wide pair (A,B). Combining the visual orbits with previously published radial velocity measurements and new radial velocities measured at CTIO, we derive dynamical masses for the three massive stars in the system of M_Aa_=16.99+/-0.20M_{Sun}_, M_Ab_=12.81+/-0.18M_{Sun}_, and M_B_=11.5+/-1.2M_{Sun}_. The inner and outer orbits in the triple are not coplanar, with a relative inclination of 120{deg}-127{deg}. The orbital parallax provides a precise distance of 387.5+/-1.3pc to the system. This is a significant improvement over previous estimates of the distance to the young {sigma} Orionis cluster.2016AJ....152..213Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/213CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/150/100 : WISE YSO candidates near sig and lam Ori (Koenig+, 2015)J/AJ/149/26 : Massive binary stars from an HST/FGS survey (Aldoretta+, 2015)J/ApJ/754/30 : VISTA photometry of {sigma} Ori cluster (Pena Ramirez+, 2012)J/ApJ/743/64 : Deep infrared photometry of {sigma} Ori cluster (Bejar+, 2011)J/ApJ/688/362 : Disks around brown dwarfs in sig Ori cluster (Luhman+, 2008)J/A+A/488/167 : Low-mass stars in {sigma} Ori and {lambda} Ori (Sacco+, 2008)J/A+A/478/667 : The Mayrit catalogue (Caballero, 2008)J/A+A/466/917 : Brightest stars of sigma Orionis cluster (Caballero+, 2007)J/ApJ/662/1067 : Sptizer observations of sigma Orionis (Hernandez+, 2007)J/AJ/128/2316 : BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/152/213https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/152/213http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/152/213https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/152/213https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/152/213http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/152/213GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/152/213/table5 (Navy Prototype Optical Interferometer (NPOI) calibrators)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/213/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/213/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/213/table5?GETtext/xml+votable180.050000true3.308963315.18359360.0055555555555555566/463 472 826 1633 1748 1769 2591 4419 6646 6674 6940 8354 8772 10783 13682 17322 17486 18804 19309 19676 22334 22511 22862 23081 23201 25973 26754 26929 27102 27215 27498 28208 48884https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/152/213?format=asciiOpticaldefaultJ/AJ/152/213/table3Positions of {sigma} Orionis Aa,Ab measured with CHARA Michigan Infrared Combiner (MIRC)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the Michigan Infrared Combiner (MIRC) observation obtained at the CHARA Arraytime.epoch;obsnullableHJDMedian Heliocentric Julian Date for the time of observation (HJD-2400000)dtime.epochdoubleSep[1/7.4] Separation {rho}maspos.angDistancefloatPA[74.5/250.4] Position Angle {theta} (measured east of north)degpos.posAngfloatemaj[0.0046/0.32] Semimajor axis of the error ellipse {sigma}_maj_ (1)masphys.angSize.smajAxis;pos.errorEllipsefloatemin[0.0019/0.053] Semiminor axis of the error ellipse {sigma}_min_ (1)masphys.angSize.sminAxis;pos.errorEllipsefloatePA[41.1/175.7] Position angle of the major axis of the error ellipsedegpos.posAngfloatfAa[0.41/0.6] Fractional flux contribution for Aa componentphot.flux;arith.ratiofloate_fAa[0.0024/0.05] Error in fAastat.errorfloatfAb[0.19/0.39] Fractional flux contribution for Ab componentphot.flux;arith.ratiofloate_fAb[0.002/0.045] Error in fAbstat.errorfloatfB[0.09/0.35] Fractional flux contribution for B componentphot.flux;arith.ratiofloate_fB[0.003/0.07] Error in fBstat.errorfloatJ/AJ/152/213/table5Navy Prototype Optical Interferometer (NPOI) calibrators_RAPosition from SIMBAD database (right ascension part)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD[886/222603] HD identification numbermeta.id;meta.mainintSpTSpectral typesrc.spTypecharVmag[1.7/5.12] V-band magnitudemagphot.mag;em.opt.VfloatV-K[-0.94/1.31] The V-K color indexmagphot.color;em.opt.V;em.IR.KfloatE(B-V)[0/0.17] The (B-V) color excessmagphot.color.excessfloatDiam[0.32/1.01] Angular diameter {theta}_V-K_ corrected for extinctionmasphys.angSizefloatV2min[0.45/1] Minimum estimated calibrator visibility V^2^_min_ based on {theta}_V-K_instr.calibfloatNn[1/16] Number of nightsmeta.numberintSimbadSimbad column added by the CDSmeta.ref.urlchar_DEPosition from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/AJ/152/213/table6Navy Prototype Optical Interferometer (NPOI) positions for {sigma} Orionis A,BrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableYearJulian year at 7UT on the date of observationyrtime.epoch;obsdoubleNv[30/1479] Number of measured visibilitiesmeta.numberintSep[254.39/260.14] Derived separation {rho} (1)maspos.angDistancefloatPA[84.17/109.8] Position Angle {theta}degpos.posAngfloatemaj[0.59/7.59] Semimajor axis of the uncertainty ellipse {sigma}_maj_masstat.errorfloatemin[0.4/2.25] Semiminor axis of the uncertainty ellipse {sigma}_min_masstat.errorfloatePA[7.4/175.3] Position angle of the major axis of the uncertainty ellipsedegstat.errorfloatO-Cr[-1.7/3.9] Deviation of the fitted relative binary position from the model values (O-C)_{rho}_masstat.fit.residualfloatO-Ct[-1.6/1] Deviation of the fitted relative binary position from the model values (O-C)_{theta}_degstat.fit.residualfloatJ/AJ/152/213/table7Navy Prototype Optical Interferometer (NPOI) positions for {sigma} Orionis Aa,AbNv[75/1479] Number of measured visibilitiesmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableHJDHeliocentric Julian Date (HJD-2400000) (1)yrtime.epochdoubleSep[0.49/7.4] Derived separation {rho}maspos.angDistancefloatPA[123.7/326.3] Position Angle {theta}degpos.posAngfloatemaj[0.08/0.9] Semimajor axis of the uncertainty ellipse {sigma}_maj_masstat.errorfloatemin[0.06/0.26] Semiminor axis of the uncertainty ellipse {sigma}_min_masstat.errorfloatePA[0.1/179.4] Position angle of the major axis of the uncertainty ellipsedegstat.errorfloatO-Cr[-0.6/1] Deviation of the fitted relative binary position from the model values (O-C)_{rho}_masstat.fit.residualfloatO-Ct[-34/9.8] Deviation of the fitted relative binary position from the model values (O-C)_{theta}_degstat.fit.residualfloatJ/AJ/152/213/table8Cerro Tololo Inter-American Observatory (CTIO) radial velocities measured for {sigma} Orionis Aa,AbrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT datetime.epochnullableHJDHeliocentric Julian Date (HJD-2400000)dtime.epochdoublePhase[0/1] Orbital phasetime.phasefloatRVAa[-87.9/59.3] Radial velocity for Aa componentkm/sphys.veloc;pos.heliocentricfloate_RVAa[2.6/50.6] Error in RVAakm/sstat.errorfloatRVAb[13.3/204] Radial velocity for Ab componentkm/sphys.veloc;pos.heliocentricfloate_RVAb[1.8/17] Error in RVAbkm/sstat.errorfloatO-CAa[-6/24.1] The radial velocity residual for Aa componentkm/sstat.fit.residualfloatO-CAb[-6.7/8.4] The radial velocity residual for Ab componentkm/sstat.fit.residualfloat