J/ApJ/908/L3ivo://CDS.VizieR/J/ApJ/908/L3doi:10.26093/cds/vizier.19089003CDSRichardson N.D.Lee L.Schaefer G.Shenar T.Sander A.A.C.Hill G.M.,Fullard A.G.Monnier J.D.Anugu N.Davies C.L.Gardner T.,Lanthermann C.Kraus S.Setterholm B.R.2024-11-06T20:23:05Z2024-03-12T06:40:21ZCDS support team

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

cds-question@unistra.frmultiple-starso-starswolf-rayet-starsvisible-astronomyspectroscopyradial-velocityWe present the first visual orbit for the nitrogen-rich Wolf-Rayet binary, WR133 (WN5o+O9I), based on observations made with the CHARA Array and the MIRC-X combiner. This orbit represents the first visual orbit for a WN star and only the third Wolf-Rayet star with a visual orbit. The orbit has a period of 112.8days, a moderate eccentricity of 0.36, and a separation of a=0.79 mas on the sky. We combine the visual orbit with an SB2 orbit and Gaia parallax to find that the derived masses of the component stars are M_WR_=9.3{+/-}1.6M{odot} and M_O_=22.6{+/-}3.2M{odot}, with the large errors owing to the nearly face-on geometry of the system combined with errors in the spectroscopic parameters. We also derive an orbital parallax that is identical to the Gaia-determined distance. We present a preliminary spectral analysis and atmosphere models of the component stars, and find the mass-loss rate in agreement with polarization variability and our orbit. However, the derived masses are low compared to the spectral types and spectral model. Given the close binary nature, we suspect that WR133 should have formed through binary interactions, and represents an ideal target for testing evolutionary models given its membership in the cluster NGC6871.2021ApJ...908L...3Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/908/L3CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/polarbase : PolarBase spectropolarimetric database (Petit+, 2014)J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)J/PASP/126/469 : PolarBase catalogue of stellar spectra (Petit+, 2014)J/ApJS/215/15 : SMaSH+; observations and companion detection (Sana+, 2014)J/A+A/562/A135 : Northern Galactic OB stars vsini (Simon-Diaz+, 2014)J/AJ/149/26 : Massive binary stars from HST/FGS survey (Aldoretta+, 2015)J/A+A/579/A68 : CANDID code interferometric observations (Gallenne+, 2015)J/AJ/152/213 : Interfer & spectroscopy of sigma Orionis (Schaefer+, 2016)J/A+A/625/A104 : Stellar param of OB stars in SMC wing (Ramachandran+, 2019)J/AJ/159/214 : UBVRI linear polarisation Wolf-Rayet winds (Fullard+, 2020)J/MNRAS/493/1512 : Galactic Wolf-Rayet stars with Gaia DR2 I (Rate+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/908/L3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/908/L3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/908/L3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/908/L3https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/908/L3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/908/L3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/908/L3/fig2The spectroscopic orbits of the two component starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[46658/58295] Heliocentric Juliand Date; HJD-2400000dtime.epochdoubleRVelWR[25.2/144] Radial Velocity of the Wolf-Rayet starkm/sspect.dopplerVelocfloate_RVelWR[3/49] Error in RVelWRkm/sstat.errorfloatRVelO[-42.3/2.6] Radial Velocity of the O starkm/sspect.dopplerVelocfloate_RVelO[1/19] Error in RVelOkm/sstat.errorfloat